A ________ is an intrusive structure that formed from magma that solidified within the "throat" of a volcano.

A. volcanic neck
B. diapir
C. laccolith
D. sill
E. batholith


Answer: A

Environmental & Atmospheric Sciences

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A. reverse faults. B. normal faults. C. synclines. D. anticlines.

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Thick accumulations of graywacke and volcanic sediments can indicate an ancient

A. transform boundary B. divergent plate boundary C. convergent boundary

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Some planktonic marine organisms produce a tiny droplet of oil to ________ density and ________ buoyancy

A) decrease; decrease B) decrease; increase C) increase; increase D) increases; decrease E) There is no relationship between density and buoyancy.

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