a.
Answer the following questions in brief.
Define atmosphere. Why is it denser in its lower layers?
b. What are ions? Why is their presence in the atmosphere significant?
Discuss how an ozone hole is created.
d. Why do polar bears face extinction in near future?
C.
Answers
Explanation:
A. An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
B. An ion is a particle, atom or molecule with a net electrical charge. The charge of the electron is considered negative by convention. The negative charge of an ion is equal and opposite to charged proton considered positive by convention.
C. Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.