Which is younger – rock unit X or B?
What will be an ideal response?
B is younger, otherwise it could not include pieces of X, which must have formed first.
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Which of the following cloud types most likely forms in an unstable atmosphere?
A. stratus B. cirrostratus C. cumulonimbus D. nimbostratus
What is the problem with using wood-block-bathtub experiments to explain the isostasy of Earth's crust?
A) It only works for sections of Earth's crust less than 8 km thick. B) It only works for sections of Earth's crust greater than 80 km thick. C) Wood is not a reasonable approximation for crust behavior. D) Bathtub water does not behave like the mantle.
Air pollution has only become an important urban problem in the last 75 years
Indicate whether the statement is true or false
Which of the following is the SI unit of radiation activity?
A) the becquerel B) the curie C) the millicurie D) the roentgen