What Makes Astronomers Think That Impact Rates for the Moon

question 11

Multiple Choice

What makes astronomers think that impact rates for the Moon must have been higher earlier than 3.8 billion years ago?

• A) all the radioactive rocks found on the Moon so far give ages much younger than that, so the Moon must have formed less than 3.8 billion years ago
• B) we see many more craters on the Moon that have been eroded by wind and rain
• C) all the large craters on the Moon come in pairs, while all recent craters are single
• D) there are ten times more craters on the older highlands than the younger maria
• E) the ancient sea basins on the Moon, whose water has since evaporated, show a lot more cratering
• Section 9.4: Origin of the Moon

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Definitions:

Cash for Clunkers

A government program intended to stimulate the economy and encourage the purchase of new vehicles by offering financial incentives for trading in older, less-efficient cars.

Bullwhip Effect

A phenomenon in supply chains where small variations in demand at the retail level cause progressively larger fluctuations in demand at the wholesale, distributor, and manufacturer levels.

Cash for Clunkers

A government program designed to stimulate the economy and improve the environment by incentivizing the trade-in of older, less fuel-efficient vehicles for newer, more efficient ones.

Bullwhip Effect

A phenomenon where small fluctuations in demand at the retail level significantly amplify as they move back through the supply chain towards manufacturers.