Which of the following best explains the formation of a medial moraine on a glacier?

A) A gravel pile that marks periods of glacial readvancement
B) A ridge of debris carried down the center of glacial ice
C) Sands and gravels that fill a subglacial stream channel
D) A ridge of debris carried along the sides of an advancing glacier


Answer: B

Environmental & Atmospheric Sciences

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If a deformed body recovers its original shape as stress is released, it is said to be:

a) brittle b) elastic c) plastic d) tensional e) compressional

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A) tetrahedron B) mineral C) rock D) mixture

Environmental & Atmospheric Sciences

An important evolutionary step for reptiles was ________

A) the growth of scales from armor plating B) the formation of a true spine C) lungs that could hold air D) the development of shell-covered eggs

Environmental & Atmospheric Sciences