Post a comment answering the following two questions about ozone depletion.In the early 1980's, scientists discovered holes in the ozone shield surrounding Earth.
1. State one negative effect this environmental change could have on humans.(40 points)
2. Write a paragraph to explain why the amount of UV (Ultraviolet radiation) reaching the surface of the Earth is increasing, and describe its effects on the living things. (40 points)
Writing in proper English:grammar, spelling, and punctuation. (10 points)
Due Day: Friday, May 21
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25 comments:
(1).more ozone layer is depleted, more UV-B is able to reach the surface of the planet. UV-B increase is one of the most harmful consequences of ozone depletion because it can cause skin cancer.The increased cancer levels caused by exposure to this ultraviolet light could be enormous.
(2).Ozone, while a minority constituent in the Earth's atmosphere, is responsible for most of the absorption of UVB radiation. The amount of UVB radiation that penetrates through the ozone layer decreases exponentially with the slant-path thickness/density of the layer. Correspondingly, a decrease in atmospheric ozone is expected to give rise to significantly increased levels of UVB near the surface.the UV have many harmful effects on the living things.Prolonged human exposure to solar UV radiation may result in acute and chronic health effects on the skin, eye and immune system. Sunburn (erythema) is the best-known acute effect of excessive UV radiation exposure. Over the longer term, UV radiation induces degenerative changes in cells of the skin, fibrous tissue and blood vessels leading to premature skin aging, photodermatoses and actinic keratoses. Another long-term effect is an inflammatory reaction of the eye. In the most serious cases, skin cancer and cataracts can occur.
1 More UV rays reach the Earth, increasing incidence of sunburn。Decreased humans' resistance to disease。
2 The increase in UV light reaching the surface of Earth is due to the thinning of the ozone layer in the upper atmosphere。 The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar region。If the entire food chain, plankton in the ocean following these "loopholes" to increase harm to or killing of UV light will be affected, because the plankton are organisms, all of the marine food chain started. Without them, there is no food for larger organisms.
1.
Damage eyes
Decreased humans' resistance to disease
Increase probability of getting skin cancer
Increase measure of sunburn because of more UV light on the Earth
2.The ozone is being destroyed due to certain gases manufacture and use of gas CFCs. The South Polar was the most destroy region. The increase in UV reaching the surface of Earth is due to the thinning of the ozone layer in the stratosphere. If the entire food chain, plankton in the ocean increased harm to or killing of UV light will be affected, because the plankton are organisms that start food chain. Without them, there is no food for larger organisms and organisms could extinct .
One of the negative effects of this environmental change is the increased probability of getting sunburned. As the ozone layer depletes, more UV rays get past through the "hole" in the ozone layer on to the Earth. Humans tend to go outside often, which inreases the incidence of sunburn.
Depletion of the ozone layer is caused mainly by the CFCs as well as other gases containing chemicals. Do to the ozone layer getting thinner through a certain amount of time, the UV rays reach the Earth faster and in larger amounts. The UV rays will have an effect on all living organisms. They might decrease organisms’ resistance to disease. If that happens, for exapmle, to insects
such as mosquitoes carrying malaria or other deathly disease, most of the population might be infected. Insect bight can be on any living organisms which includes animals as well. The food chain will be disrupted.
1-Ozone depletion has major effect on human. Every time the ozone layer is depleted, more UV-B is able to reach the surface of the planet. UV-B increase is one of the most harmful consequences of ozone depletion because it causes skin cancer.
2-The increase in Ultraviolet light reaching the surface of earth is due to the thinning of the ozone layer in the upper atmosphere. The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar Region. If plankton in the oceans below these holes is harmed or killed by the increase in UV light, entire food chain will be disrupted. Without them, there would be no food for larger organisms.
MARIAM.T
1. Ozone depletion has negative aspects. one of them is the less ozone the earth has the more UV radiation reaches the surface of the earth, which is not good, because the rate of skin cancer increases.
2.Ultra Violet radiation is harmful because it causes sunburn, which later on turns into skin cancer it damages eyes,decreases organisms resistance to disease, damages tissue in plant leaves and phytoplankton in the oceans, it also disrupts food chains in the ocean.
1) A decreased ozone layer could cause skin cancer ,increase rates of malaria, and other infectious diseases.
2) The production and emission of CFCs, chlorofluorocarbons are considered so far as the major causes of Ozone Depletion. The ozone depletes when more ultraviolet reaches Earth. As a result, it affects negatively the environment. The life cycles of plants could change. Food chains will be disrupted. Other ecosystems such as forests and deserts will also be harmed. It could alter the planet's climate resulting in climatic changes throughout the world.
(1): Here we investigate the
interplay between projected future emissions of greenhouse
gases and levels of ozone-depleting halogen species using a
global climate model that incorporates simplified ozone-depletion
chemistry. Temperature and wind changes induced by the increasing greenhouse-gas concentrations alter planetary-wave
propagation in our model, reducing the frequency of sudden
stratospheric warmings in the Northern Hemisphere4. This
results in a more stable Arctic polar vortex, with significantly
colder temperatures in the lower stratosphere and concomitantly
increased ozone depletion. Increased concentrations of greenhouse
gases might therefore be at least partly responsible for the
very large Arctic ozone losses observed in recent winters6–9. Arctic
losses reach a maximum in the decade 2010 to 2019 in our model,
roughly a decade after the maximum in stratospheric chlorine
abundance. The mean losses are about the same as those over the
Antarctic during the early 1990s, with geographically localized
losses of up to two-thirds of the Arctic ozone column in the worst
years. The severity and the duration of the Antarctic ozone hole
are also predicted to increase because of greenhouse-gas-induced
stratospheric cooling over the coming decades.
(2): Stratospheric ozone levels are near their lowest point since measurements began, so current ultraviolet-B (UV-B ) radiation levels are thought to be close to their maximum. Total stratospheric content of ozone-depleting substances is expected to reach a maximum before the year 2000. All other things eing equal, the current ozone losses and related UV-B increases should be close to their maximum. Increases in surface erythemal (sunburning) UV radiation relative to the values in the 1970s are estimated to be: about 7% at Northern Hemisphere mid-latitudes in winter/spring; about 4% at Northern Hemisphere mid-latitudes in summer/fall; about 6% at Southern Hemisphere mid-latitudes on a year-round basis; about 130% in the Antarctic in spring; and about 22% in the Arctic in spring. Reductions in atmospheric ozone are expected to result in higher amounts of UV-B radiation reaching the Earth's surface. The expected correlation between increases in surface UV-B radiation and decreases in overhead ozone has been further demonstrated and quantified by ground-based instruments under a wide range of conditions. Improved measurements of UV-B radiation are now providing better geographical and temporal coverage. Surface UV-B radiation levels are highly variable because of cloud cover, and also because of local effects including pollutants and surface reflections. These factors usually decrease atmospheric transmission and therefore the surface irradiances at UV-B as well as other wavelengths. Occasional cloud-induced increases have also been reported.
Mariam.T
I have a question.Was there any other homework besides this one while I wasn't in class on Thursday & Friday?
1) One or more negative effect this environmental(Ozone Depletion) change could have on humans are more cancers and damage eyes.Decrease of organisms that resistance to disease.Damage tissue in plant leaves and phytoplankton in the oceans and it will also effect the food we are eating.
2)The increase in UV light reaching the surface of Earth is due to the thinning of the ozone layer in the upper atmosphere.The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar region.If plankton in the oceans below these “holes” is harmed or killed by the increase in UV light, entire food chains will be disrupted because the plankton are the organisms that start all of the ocean food chains. Without them, there would be no food for larger organisms.
1)One negative effect that Ozone depletion cause in the environment and be damage for the humans is sunburn, and skin cancer can be cause for the ozone depletion also damage eyes .
2) The increase in UV light reaching the surface of Earth is due to the thinning of the ozone layer in the upper atmosphere.
The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar region.
If plankton in the oceans below these “holes” is harmed or killed by the increase in UV light, entire food chains will be disrupted because the plankton are the organisms that start all of the ocean food chains. Without them, there would be no food for larger organisms
1 - One of negative effects that the environmental change could have on humans is cancer.
2 - The reason for creating the ozone hole is the destruction of ozone in the atmosphere by CFCs. These are chemicals that as a result of ultraviolet radiation break down into carbon, fluorine and chlorine. Also, UV radiation can also damage tissue in plant leaves an even phytoplakton in the ocean. In addition, disrupt food chains in the water.
As a last effects on the living things are increasing incidence of sunburn, also more UV rays decreased human resistance to diseases.
1.
One negative effect that this environmental change could have on humans is the cause of bad conditions of health, respiratory problems,and it also increases possibilities of skin cancer.other effect that can occur with this change is damage on the eyes.
2.
The amount of UV is increasing on earth because of the cfcs that has an enormous capacity to destroy large amounts of ozone. These CFCS is a molecule coming from sprays, cans, and refrigerators units. The CFCS will damage the ozone layer making the UV and high temperature increase on earth.
Writing in proper English:grammar, spelling, and punctuation. (10 points)
1)One negative effect will be if Humans get the radiation from the sun and this cause sunburn.This change can bring consequences like cancer, damage eyes and decreases organisms' resistance. Also the UV can damage tissue in plants leaves and phytoplankton in the oceans. The Ozone Layer serves as sunscreen and without this layer it will be dangerous.
2)The amount of UV reaching the surface of the earth is increasing because of gases called chlorofluorocarbons or CFCs that damage the Ozone Layer. the food chain will be "alter" because the plankton starts the food chain in the ocean. If they are not there. There wouldn't be food for larger organisms.
1) If the UV light reach the earth, it can cause diseases like skin can cancer malaria it can also increase sunburn and also damage our eyes. The UV radiation can also damage tissue in plant leaves an even phytoplakton in the ocean.
2) As stratospheric ozone decreases, UV radiation is allowed to pass through, and exposure at the Earth’s surface increases. Exposure to shorter wavelengths increases by a larger percentage than exposure to longer wavelengths. The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The life cycles of plants could change. Food chains will be disrupted.
ms soto im alvaro.....i have a question....para cuando es el project ???
1.Along with the depletion of ozone from the stratosphere, more ultraviolet rays reach the earth's crust and the humans causing higher chance of skin cancer such as malignant melanoma and cortical cataracts.
2.Ultraviolet rays are harmful to humans and crops if the increased amount of them reaches the surface,
the exposure to uv radiation affects humans in the form of illnesses mentioned above, however crops such as rice, for example, need a special kind of bacteria called cyanophyta which resides in the roots of the plant and it's contribution is significant to the development of rice, ultraviolet radiation is able to annihilate them due to their scarcity of protection against it, causing the rice to wither.
1.-More UV rays reach the Earth, increasing incidence of sunburn
-Increased incidence of skin cancers and/or cataracts
-Decreased humans’ resistance to disease
2. The increase in UV light reaching the surface of Earth is due to the thinning of the ozone layer in the upper atmosphere.
The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar region.
If plankton in the oceans below these “holes” is harmed or killed by the increase in UV light, entire food chains will be disrupted because the plankton are the organisms that start all of the ocean food chains. Without them, there would be no food for larger organisms.
the ozone layer effects the human impact by causing the skin caner and sunburn howoften the more of UV radition that reach the earth increasing incide of sun burn and decreasing oraganisms resistance to diseases also it damages tissue in plant leaves and phytoplankton in the ocean which is bistrupting the food chains in the oceans and many speaise extinat . the molecules reponsable is CFC which damages the ozone layer an propellat in the aerosol cans and air conditinar and that caused by the releace of gases of CFC the atomoshper
(1)... Basal and Squamous Cell Carcinomas -- The most common forms of skin cancer in humans, basal and squamous cell carcinomas, have been strongly linked to UVB exposure. The mechanism by which UVB induces these cancers is well understood — absorption of UVB radiation causes the pyrimidine bases in the DNA molecule to form dimers, resulting in transcription errors when the DNA replicates. These cancers are relatively mild and rarely fatal, although the treatment of squamous cell carcinoma sometimes requires extensive reconstructive surgery.
(2)...Causes of Ozone Depletion
Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction. Although natural phenomena can cause temporary ozone loss, chlorine and bromine released from man-made compounds such as CFCs are now accepted as the main cause of this depletion.
**CFC (Chlorofluorocarbons) is a gas that can cause Ozone Depletion.
han yeop
1. State one negative effect this environmental change could have on humans.(40 points)
Sunburn
Cancer
Damage eyes
Decrease organisms’ resistance to disease
Damage tissue in plant leaves and phytoplankton in the oceans
Disrupt food chains in the ocean
2. Write a paragraph to explain why the amount of UV (Ultraviolet
radiation) reaching the surface of the Earth is increasing, and describe its effects on the living things. (40 points)
The increase in UV light reaching the surface of Earth is due to the thinning of the ozone layer in the upper atmosphere.
The ozone is being destroyed due to certain gases manufacture and use, including CFCs. The loss has been most severe over the South Polar region.
If plankton in the oceans below these “holes” is harmed or killed by the increase in UV light, entire food chains will be disrupted because the plankton are the organisms that start all of the ocean food chains. Without them, there would be no food for larger organisms.
CFCs, ChloroFluorCarbons used as
Propellants in aerosol cans
Coolant in refrigerator,
Freezers
Air conditioners
Production of plastic foams
(1) Because of the ozone depletion the UV is very easy to get into the earth. Uv can cause us skin cancer also can damage our eyes.
(2) The increasing amount of uv in the earth is cause by ozone depletion. Ozone depletion is cause by the gas that produced by air conditioner is known as CFCs. This gas made the ozone layer thinner, than the amount of Uv increase.UV can make some animals became extinct for example the bear in North pole. They cannot live in high tempeture place. Uv also the one cause of Global warming.
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