Rainforests are Earth's oldest living ecosystems, with some surviving in their present form for over ______________.
60 million years
70 million years
80 million years
What are the two types of rainforests?
temperate and tropical
sub-tropical and temperate
tropical and taiga
Tropical rainforests are primarily located in ____________.
Rainforests receive up to about _____ feet of rain per year.
Rainforests absorb ______________.
Rainforests create about _______ of Earth's breathable air.
What is deforestation?
a) both b and c are correct
b) cutting down trees to use the land for something else, like a farm.
c) cutting down trees to develop land for homes and businesses.