________ is the process by which thickened crust adjusts over time to a "normal" thickness
A) Subduction
B) Convection
C) Accretion
D) Isostacy
Answer: D
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Favorable conditions or attributes of a place that attract migrants are known as:
A) push factors B) pull factors C) positive checks D) preventive checks E) none of the above
The number of people over 65 represented as a percentage of the labor force is described as a(n)
A) dependency ratio. B) elderly support ratio. C) K-12 support ratio. D) national retirement ratio. E) demographic transition.
Desert landforms, referred to as fans, can be made by ____
a. streams and debris flows b. salt weathering and the wind c. groundwater evaporation and weathering d. solution and the wind
Sediments that are poorly sorted were most likely deposited by ________
A) a glacier B) a river delta C) organisms D) a volcanic eruption E) the wind