Which of these descriptions describes desertification?
a.-the ability of humans to adapt to conditions in the desert
b.-the process of converting deserts into habitable land
c.-the process by which fertile land converts into desert
d.-the ability to divert a water flow with a human-made dam

Why is the future for life on earth bleak?

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.