In East Africa, the peasant mode of agricultural production provides most farmers with an adequate and varied food supply
Indicate whether the statement is true or false
TRUE
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Crust is neither created nor destroyed at which types of plate boundaries?
a. Transform b. Spreading centers c. Subduction zones d. Rifts e. Convergent
What effect for lithosphere can be found due to convergent plate boundaries?
a. Oceanic lithosphere created b. Oceanic lithosphere destroyed, after one oceanic plate sank into the mantle c. Lithosphere neither created or destroyed d. Continental lithosphere created
In the late 1970s, the United States banned the non-essential use of chlorofluorocarbons (CFCs). Why?
A) CFCs are a primary component of photochemical smog. B) CFCs are toxic gases. C) CFCs reduce the ozone concentration in the stratosphere. D) CFCs react with water vapor to form acid rain.
How have oceanographers learned most about the geology of the sea floor?
a) Exploration by submarines and submersibles b) Scuba diving c) Mapping by satellite d) Acoustic (seismic) sounding and profiling e) Remotely operated vehicles (ROV) and cameras