Why are ultramafic volcanics rare in rocks that are much younger than Archean in age?
Question 2Which statement about caves is false?
A)They form underwater.
B)They are formed by deposition of calcium carbonate.
C)They form naturally and are open to the surface.
D)The majority of caves are small.
E)They are commonly found in regions with karst topography.
Question 3Calderas are formed when ____.
A)low-viscosity magma flows out into very large areas and cools
B)pyroclastic flows mix with lava flows
C)the volcanic pipe is plugged and the increase in pressure causes a huge explosion
D)part of a magma chamber drains and the mountain's summit collapses into the vacated space below
E)large explosions at the base of a volcano cause the volcano to collapse
Question 4What are prokaryotic organisms?
Question 5What conditions are needed for the development of karst topography?
A)humid climate
B)arid climate
C)carbonate bedrock at a shallow depth
D)humid climate and carbonate bedrock at a shallow depth
E)an artesian aquifer
Question 6The three major types of volcanoes are ____.
A)shield volcanoes, cinder cones, and lava domes
B)shield volcanoes, cinder cones, and composite volcanoes
C)cinder cones, composite volcanoes, and lava domes
D)composite volcanoes, stratovolcanoes, and lava domes
E)shield volcanoes, composite volcanoes, and stratovolcanoes
Question 7What are heterotrophic organisms?
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