Which is NOT an example of sustainability? A)
establishing regulations on emissions
B)
planting trees to replenish a logged forest
C)
installing water systems to reuse gray water
D)
exhausting a natural resource to make a profit

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

How much water is in the ocean in cubic kilometers

Which of the following terms describes the layers of air surrounding the earth ?