What was the main cause of the Dust Bowl in the 1930s?
A. unusually cold weather
B. stronger than normal storms
C. flooding caused by climate change
D. poor soil and land management
D. poor soil and land management
A student writes two statements about the importance of soil.
1. Soil can act as a filter and keep pollutants out of groundwater.
2. Soil can be used as a natural building material.
Which of these describes whether the statements correctly describe the importance of soil?
A. both statements 1 and 2 correctly describe the importance of soil.
B. only statement 1 correctly describes an importance of soil.
C. only statement 2 correctly describes an importance of soil.
D. neither statement 1 nor 2 correctly describes the importance of soil.
A. both statements 1 and 2 correctly describe the importance of soil.
A student makes a list of all the soil layers in a temperate region. Which layer would be located farthest from the surface of the earth?
A. bedrock (R)
B. organic layer (O)
C. topsoil (A)
D. parent material (C)
A. bedrock (R)
Why is soil considered to be a nonrenewable natural resource?
A. it uses a lot of earth's energy.
B. it can never be replaced.
C. it takes so long to form
D. it is easily transported