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
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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?
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
Flow of saturated soils during periods of melting permafrost is known as:
a. solifluction b. frost heave c. permafrost flow d. rock-glacier flow
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