Question

1. the greenhouse effect is a natural process that allows life on earth to thrive. however, human activities have intensified this effect, leading to global warming. which of the following best describes the greenhouse effect? (a) the trapping of heat by atmospheric gases (b) the absorption of uv radiation by the ozone layer (c) the cooling of earths surface during the night (d) the reflection of sunlight by ice caps

Explanation:

The greenhouse effect is defined as the trapping of heat by atmospheric gases (like carbon dioxide, methane, etc.). These gases allow sunlight to enter the Earth's atmosphere but prevent some of the heat (infra - red radiation) from escaping back into space.

• Option B is about the ozone layer's role in absorbing UV radiation, which is a different atmospheric process (related to protecting from harmful UV rays, not the greenhouse effect).
• Option C is about the normal cooling of the Earth's surface at night due to heat loss (not related to the greenhouse - gas - mediated trapping of heat).
• Option D is about the albedo effect (reflection of sunlight by ice caps, which affects the amount of solar energy absorbed by the Earth but is not the greenhouse effect itself).

Answer:

A. The trapping of heat by atmospheric gases