The Rate of Cratering in the Lunar Highlands Shows Us

question 72

Multiple Choice

The rate of cratering in the lunar highlands shows us that:

• A)they must be younger than the older, darker mare.
• B)they range from 4.6-4.4 billion years old, on average.
• C)the largest impacts are the youngest, such as Copernicus and Tycho.
• D)the oldest rocks are at least as old as the mare, but some craters are much younger.
• E)most of the asteroids must have hit the Moon, not the Earth.

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Definitions:

Equilibrium

A state in which opposing forces or influences are balanced, often used in chemical contexts to describe reactions.

Aerobic Respiration

The process by which cells use oxygen to break down glucose and produce ATP, involving the Krebs cycle and electron transport chain.

Pyruvate

An important organic acid in biochemistry, serving as an end product of glycolysis and a substrate for the citric acid cycle.

Pyruvate Ion

The ionized form of pyruvic acid, an important intermediate in several metabolic pathways, including glycolysis.