The two most common elements found in Earth's crust are:
a. silicon and magnesium.
b. sodium and carbon.
c. silicon and aluminum.
d. silicon and oxygen.
e. sodium and potassium.
D
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Straight-line boundaries between states suggest that the boundary was based on natural features, such as rivers or mountains
Indicate whether this statement is true or false
Cultivation of seafood under controlled conditions is called
A) controlled fish production. B) environmentally controlled seafood production. C) aquaculture. D) overfishing. E) seafood culture.
The four major subsystems of the Earth system are the atmosphere, hydrosphere, lithosphere, and _______________
Fill in the blank(s) with correct word
What is the important measure from weather radar that gives the intensity of the precipitation?
A) time of the echo B) brightness of the echo C) number of echoes from a single point D) height of the echo E) none of the above