What is the ingredient found in topsoil that's necessary for plant growth?
A) air
B) mineral matter
C) humus
D) surface litter
C
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Which of the following is not true of soil?
A) Soil contains a complex food web B) Fertilized soils are a source of water pollution C) Soil serves as a sink for carbon dioxide D) Soil can immobilize contaminants and remediate waste E) All of these choices are correct.
Problems associated with the construction of the Three Gorges Dam include all the following, EXCEPT
A) the displacement of more than one million people. B) the diversion of two other major rivers to fill the Three Gorges reservoir. C) the flooding of a major scenic attraction. D) the jeopardizing of several endangered species. E) building what is the largest hydroelectric dam in the world.
These regions along a fault zone are considered most likely to be the sites of future earthquakes than other portions of that fault zone.
A. seismic gap B. epicenter C. focus
In two hours and 10 minutes Earth will rotate 48 degrees
Indicate whether the statement is true or false