Ultramafic lava flows are significant in the Archean rock record because they indicate that Earth was 90 percent
molten.
a. True
b. False
False
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What is the main obstacle to extracting rare-earth metals from a deposit?
A. They are typically found at low concentrations in the host rock. B. They are equally distributed around the world. C. There is a lack of technological understanding about how to extract them. D. There is no demand for them on the world market.
Which of the following represents the best wind pattern for monsoon precipitation conditions?
A) A
B) B
C) C
D) None of these choices are best at maximizing monsoon precipitation.
How are marker beds used to determine the age of strata in a region that has no marker beds but does
contain strata with the same fossil assemblage zone? What will be an ideal response?
Which of the following occurs when rhodopsin absorbs light?
A) The less stable 11,12-cis isomer is converted to the more stable trans isomer. B) the less stable 11,12-trans isomer is converted to the more stable cis isomer. C) The more stable 11,12-cis isomer is converted to the less stable trans isomer. D) The more stable 11,12-trans isomer is converted to the less stable cis isomer.