Multiple choice

Which of the following statements is/are correct?

a. An increase in sunspot numbers is associated with warm and drier conditions. b. Volcanism causes an increase in Earth's temperature. c. Greenhouse gases cause global warming.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a, b and c

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

This statement is correct.