6.

The average American has a greater impact on the environment than the average African.


True


False

7.

A green roof provides insulation and reduces:


El Nino


urban inhabitants


rainy weather


the heat island effect

8.

Without the top predators in a food chain:


global warming can happen.


lower species will over-multiply and destroy an ecosystem.


the ecosystem is better off.


humans will not be able to eat.

9.

When deep cool ocean water is brought up to the surface, it contains many:


rocks


nutrients


sharks


sand