Which feature on this diagram is an arête?
A) 1, the circular depression at the head of the valley
B) 2, a lake in the upper valley
C) 3, a steep ridge
D) 4, a valley that is above the level of the main valley
C) 3, a steep ridge
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What property of an electron makes it possible to use electron microscopes?
A. They are electrically charged. B. They have shorter wavelengths than visible light. C. They can be generated with electricity. D. They can be focused using smaller lenses. E. none of the above
The existence of stream terrace is sure evidence of ____.
a - entrenched meanders b - delayed tributary junction c - rejuvenation d - knickpoint e - volcanic activity
What valuable commodity has yet to be commercially mined from ocean sediments?
a. Natural gas b. Gravel c. Diatomaceous earth d. Manganese nodules
What happens to climax communities after a disruption? How do these communities re-establish themselves after a disruption like a tropical storm? What is this process called?