What happens when a glacier encounters the sea or a lake?
A) The ice is denser than water and so scrapes along the bottom.
B) White icebergs float but blue icebergs sink to the bottom.
C) Large blocks of ice collapse off the front of the glacier and become icebergs.
D) Rocks released from melted icebergs float on the water surface.
E) All of these are correct.
C) Large blocks of ice collapse off the front of the glacier and become icebergs.
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Pyroclastic igneous rock forms from ____
A)explosive volcanic activity B)rapidly cooling plutons C)viscous lava flows D)basalt and gabbro E)melting of country rock
Because of the nature of the world-wide climatic conditions in the Mesozoic, organisms ____
A)had few habitats to occupy B)could occupy extensive geographic regions C)could only occupy restricted geographic regions D)were not affected E)stayed where they were
Lightning flows ____
a. only in areas of heavy rainfall b. from the top of a thundercloud to the ground, passing through the lower cloud c. from the cloud and the ground to a midpoint at low altitude d. only in the area directly below the thundercloud e. from the cloud to the ground in short, zig-zagging steps