Continents are the product of mountain building at ancient ________ boundaries.
A) transform
B) divergent
C) convergent
D) decorticate
Question 2
Read carefully through the paragraph below, and decide which of the options is correct. The principle of isostasy explains variations in surface elevations in terms of the type and thickness of underlying crust.
Low-density crust floats on denser, underlying mantle so that the temperature is everywhere the same at the base of any thick vertical column through the crust and upper mantle.
A) The word isostasy should be replaced by superposition.
B) The word elevations should be replaced by pressures.
C) The word temperature should be replaced by pressure .
D) The words underlying crust should be replaced by underlying mantle.
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