The drift speed of electrons in a typical circuit is

A. about the speed of sound.
B. about the speed of light.
C. a snail's pace.
D. none of the above


Answer: C

Environmental & Atmospheric Sciences

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There is no evidence in the geologic record that multi-celled organisms of any kind existed prior to the Cambrian

Indicate whether the statement is true or false

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Earthworms ________

A) literally "suck" nitrogen out of the soil B) are not able to eat microorganisms C) usually guarantee the soil will be poorly productive D) are most numerous in arid climates E) increase soil porosity

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Describe the centers of gyres, and explain how they may contribute to pollution in the ocean. What will be an ideal response?

Environmental & Atmospheric Sciences

Flow of saturated soils during periods of melting permafrost is known as:

a. solifluction b. frost heave c. permafrost flow d. rock-glacier flow

Environmental & Atmospheric Sciences