A ________ is a volcanic depression much larger than the original crater, formed when the volcano collapses into a vacated magma chamber.

A. caldera
B. vent
C. ring dike
D. basin
E. crater


Answer: A

Environmental & Atmospheric Sciences

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A)very steep resulting in volcanism near the trench B)very shallow resulting in volcanism near the trench C)very steep causing deformation far inland D)very shallow causing deformation far inland E)almost vertical

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The upper half of the ________ zone is the only place in the ocean where there is sufficient light to support photosynthesis

A) abyssopelagic B) bathypelagic C) epipelagic D) mesopelagic E) nektopelagic

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Which type of ore deposit originated before there was free oxygen in the atmosphere?

a. banded iron formation b. manganese nodules c. colcanogenic copper d. gold placer deposits e. bauxite

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A) winter. B) nighttime. C) summer. D) autumn.

Environmental & Atmospheric Sciences