Permafrost and the Tropical Forest
Casual Mode - Take your time!
1 / 15
Correct
0
Incorrect
0
Score
0%
Multiple Choice
What is permafrost?
- A layer of soil that remains frozen for two or more consecutive years
- A layer of soil that remains frozen for less than two consecutive years
- A layer of soil that remains frozen for more than ten consecutive years
- A layer of soil that remains frozen for more than twenty consecutive years