Multiple choice

Greenhouse effect refers to which of the following?

  1. Cooling of earth

  2. Trapping of UV rays

  3. Production of cereals

  4. Warming of earth

  5. -

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere. If a planet's atmosphere contains radioactively active gases (greenhouse gases), the atmosphere will radiate energy in all directions.