Depletion of the ozone layer in the stratosphere is responsible for:
Skin cancer
Understanding Ozone Layer Depletion and Its Impact
The Earth's atmosphere has different layers, and the stratosphere is one of them. Within the stratosphere lies the ozone layer, which plays a crucial role in protecting life on Earth.
What is the Ozone Layer?
The ozone layer is a region of high ozone concentration in the stratosphere, approximately 15 to 35 kilometers above the Earth's surface. Ozone (\(\text{O}_3\)) is a molecule made up of three oxygen atoms.
How Does the Ozone Layer Protect Us?
The primary function of the ozone layer is to absorb most of the Sun's harmful ultraviolet (UV) radiation, particularly UV-B and UV-C rays. These types of UV radiation have high energy and can cause significant damage to living organisms.
What is Ozone Depletion?
Ozone depletion refers to the thinning of the ozone layer. This process is mainly caused by human-produced chemicals, such as chlorofluorocarbons (CFCs) and halons, which were widely used in refrigerants, aerosols, and fire extinguishers. When these chemicals reach the stratosphere, they are broken down by UV radiation, releasing chlorine and bromine atoms. These atoms then catalyze the destruction of ozone molecules.
The depletion of the ozone layer allows more UV-B radiation to reach the Earth's surface. Increased exposure to UV-B radiation has several detrimental effects on human health and the environment.
Impact of Increased UV Radiation Due to Ozone Depletion
The question asks about the consequences of ozone layer depletion. Let's look at the options provided:
- Cholera: Cholera is an infectious disease caused by bacteria found in contaminated water or food. It is not directly caused by ozone depletion or increased UV radiation.
- Increase in Carbon dioxide: An increase in carbon dioxide is a major contributor to the greenhouse effect and climate change. While environmental issues are interconnected, the increase in \(\text{CO}_2\) is primarily linked to the burning of fossil fuels and deforestation, not directly to ozone depletion.
- Increase in Sulphur dioxide: An increase in sulphur dioxide (\(\text{SO}_2\)) is a primary cause of acid rain and respiratory problems. \(\text{SO}_2\) emissions are largely from the burning of fossil fuels containing sulfur. This is not directly related to ozone depletion.
- Skin cancer: Exposure to high levels of UV radiation, especially UV-B, is a known major risk factor for various types of skin cancer, including melanoma, basal cell carcinoma, and squamous cell carcinoma. The thinning of the ozone layer leads to increased penetration of UV-B radiation, thus increasing the risk of skin cancer in humans.
Based on the effects of increased UV radiation resulting from ozone depletion, skin cancer is a direct and significant consequence.
Health Effects of Increased UV Radiation Exposure
Besides skin cancer, increased UV radiation can also cause:
- Sunburn
- Premature skin aging
- Eye damage, including cataracts
- Suppression of the immune system
Therefore, depletion of the ozone layer in the stratosphere is directly responsible for increasing the risk of skin cancer.
| Environmental Issue | Primary Cause(s) | Key Impact(s) |
|---|---|---|
| Ozone Depletion | CFCs, Halons | Increased UV radiation reaching Earth, Skin cancer, Eye damage |
| Increased \(\text{CO}_2\) | Burning fossil fuels, Deforestation | Greenhouse effect, Climate change, Global warming |
| Increased \(\text{SO}_2\) | Burning fossil fuels (coal, oil) | Acid rain, Respiratory issues, Environmental damage |
| Cholera Spread | Bacteria (Vibrio cholerae) in contaminated water/food | Severe dehydration, Diarrhea |
Revision Table: Key Terms and Concepts
| Term | Description |
|---|---|
| Ozone Layer | Region in the stratosphere with high ozone concentration, absorbs UV radiation. |
| Stratosphere | Layer of Earth's atmosphere above the troposphere, where the ozone layer is located. |
| Ozone Depletion | Thinning of the ozone layer, primarily due to human-made chemicals. |
| UV Radiation | Ultraviolet radiation from the sun, harmful to living organisms at high exposure. |
| Skin Cancer | Abnormal growth of skin cells, a major risk increased by UV exposure. |
Additional Information: Protecting the Ozone Layer
International agreements like the Montreal Protocol have been effective in phasing out the production and consumption of ozone-depleting substances. This has led to a gradual recovery of the ozone layer over time. Continued efforts are needed to ensure its full recovery and minimize future threats.
Protecting yourself from the harmful effects of increased UV radiation is also important. This includes:
- Wearing sunscreen
- Wearing protective clothing (hats, long sleeves)
- Seeking shade during peak sun hours
- Wearing UV-protective sunglasses
Important Questions from Globalization and Social Change
- Diaspora as a dispersion of people throughout the world indicates
A. Lack of Solidarity with members of the same ethnic group
B. Emergence of expatriate communities
C. Greater cultural hybridity
D. Complete dissociation from the foreign areas
Choose the correct answer from the options given below : - The concept of "Transnationalism" is associated with the process of :
Anthony Giddens' notion of "Radicalised Modernity" has following characteristics :
(A) It sees itself as dissolved or dismembered by fragmenting the experience
(B) It identifies the institutional developments which create a sense of fragmentation and displaced
(C) It defines post-modernity as possible transformations moving beyond the institutions of modernity
(D) It sees day-to-day life as an active complex of reactions to abstract systems involving appropriation as well as loss
Choose the correct answer from the options given below :
The key features of the globality of global economy, according to Manuel Castelles are :
(A) Anti-globalization movement
(B) Global Financial markets
(C) Multinational corporations
(D) International production of work
(E) International production and selective globalisation of science and technology
Choose the correct answer from the options given below :
Group the traits as explained by Saskia Sassen in the 'global city'.
A. They have developed into command posts for the global economy
B. They are key locations for financial and specialized service firms
C. They are sites of production and innovation
D. They are markets in which the products of financial and service industries
E. They are relatively large forms of human settlement
Choose the correct answer from the options given below:
