Most meteorites originate in the
A) Kuiper belt.
B) Astroid belt.
C) Halley's comet.
D) Sun.
Answer: B
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Economic ________ occurs when a mineral reserve costs more to mine than what it can be sold for.
Fill in the blank(s) with the appropriate word(s).
An erosional surface that separates tilted strata below from flat lying strata above is called a/an
a. angular unconformity. d. hiatus. b. disconformity. e. bedding plane. c. nonconformity
Which of the following is an effective technique for reducing soil erosion?
A. all of the answers listed here B. strip cropping C. terracing D. no-till farming E. contour plowing
As shown in Figure 8.12, what has happened to the number of species on Earth as the human population has grown?
A. decreased B. matched it exactly C. increased slightly D. increased greatly