Columnar joints, like the ones shown in the photograph, are formed
A. when hot liquid igneous rock contracts.
B. when hot liquid igneous rock expands.
C. when hot but solid igneous rock expands.
D. when hot but solid igneous rock contracts.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
Nutrients in coral reefs are ____.?
A) ?extremely limited, which is why productivity is lower than the deep ocean B) ?so plentiful that there is no limit to phytoplankton growth C) ?largely trapped below the pycnocline D) ?recycled efficiently because the water is shallow
Due to the ice-albedo feedback, a reduction in sea ice due to a warming climate
A) generates sulfate aerosols which can warm the climate. B) leads to an increase in oceanic areas covered by ice. C) leads to enhanced warming. D) leads to reduced warming.
Masses of igneous rock that cooled and solidified beneath the surface are called igneous _______________
Fill in the blank(s) with correct word