Felsic magma is ___________________ than mafic magma.
a. lower in silica and flows more less easil
b. higher in silica and flows more easily
c . higher in silica and flows less easily
d. lower in silica and flows flows less easily
Answer: c . higher in silica and flows less easily
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The Don River lies in the European part of the Northern Eurasian region, and therefore:
A) is largely untouched by human development B) suffers from diverse and numerous sources of pollution C) empties into the Pacific Ocean D) is free from cold winter conditions
Humans have drilled well into Earth's mantle
Indicate whether the statement is true or false
Food security has to do with
A. A country's dependence on cash crop exports. B. Preventing wars over diminishing food supplies. C. The total volume of food a country imports. D. The total volume of aid a country receives. E. The ability of a population to obtain food on a day-to-day basis.
Which of the following is vorticity relative to the Earth's surface?
A) earth vorticity B) absolute vorticity C) relative vorticity D) astronomical vorticity