The downward plunge of cold lithosphere accounts for the existence of oceanic trenches as well as their low heat flow.
Answer the following statement true (T) or false (F)
True
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Along divergent plate boundaries, magma formation takes place typically due to:
a) melting of the plates as they move apart as a result of frictional heating b) increased pressure from plate movement c) pressure being reduced (decompression melting) as the plates move apart d) water being released under pressure which lowers the melting temperature of the overlying asthenosphere e) hot spots, which always occur along divergent boundaries
Volcanic island arc activity is short-lived and as a result will only produce tiny islands
Indicate whether this statement is true or false.
The boundary that separates the crust from the mantle is the ________.
A. Mohorovicic discontinuity B. shadow zone C. lithospheric discontinuity D. mantle discontinuity E. athenospheric discontinuity
Nitrate in groundwater can be increased by infiltration of runoff from all of the following except
A. fields treated with synthetic fertilizers containing nitrogen. B. glacial melt. C. manure from cattle feedlots. D. sewage-treatment waste water.