The average thickness of oceanic crust is:
A. 50 km
B. 5 km
C. 7 km
D. 12 km
Answer: C
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Terracing, contour farming, intercropping, and crop rotation all ________
A) are prohibited in organic farming B) are techniques for conserving soil resources and fertility C) contribute to erosion and desertification D) are aspects of IPM E) contribute to leaching
The ________ is the maximum distance people are willing to travel to use a service
A) threshold B) range C) distance D) hierarchy E) law of equidistance
Judge the following sentence according to the criteria given below: All marine algae must live near the ocean surface BECAUSE this is where food can be obtained
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
To avoid a decline in prices for some minerals, producing countries have occasionally joined together in cartels—organizations that agree to control and limit production
Indicate whether the statement is true or false.