Ultramafic lava flows are significant in the Archean rock record because they indicate that Earth was 90 percent

molten.
a. True
b. False


False

Environmental & Atmospheric Sciences

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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?

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences