The asthenosphere can best be described as
A) a liquid. B) a plasma. C) a plastic. D) a rigid solid.
C
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China has lower costs for the mining of rare earth minerals because of ____.
A. the lack of strict environmental regulations B. their larger deposits C. the proximity of their deposits to the earth's surface D. the accessibility of their minerals without subsurface mining E. superior mining technology
In general, the healthiest soil texture for plants is one in which
A) sand dominates, clays are next highest in concentration, and silt has the smallest concentration. B) clay dominates, sands are next highest in concentration, and silt has the smallest concentration. C) sand dominates, silts are next highest in concentration, and clay has the smallest concentration. D) there is a relatively even percentage of sand, silt, and clay.
What happens when fresh water flows into seawater?
A) They mix completely. B) There is a continuous gradation from seawater on top to fresh water on the bottom. C) The fresh water covers the sea water. D) The sea water covers the fresh water. E) There is a continuous gradation from fresh water on top to sea water on the bottom.
The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is
A) half as much. B) the same. C) twice as much. D) four times as much. E) none of the above