Multiple choice

The greenhouse gas carbon dioxide helps to ___

  1. maintain warmth near Earth's surface

  2. increase precipitation in arid areas

  3. form clouds in the atmosphere

  4. deflect harmful radiation from space

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

Carbon dioxide is a greenhouse gas that traps infrared radiation emitted by the Earth, helping to maintain the planet's surface temperature at a level suitable for life.