Mercury Is Pockmarked with Meteorite Craters, While the Earth Is

question 57

Multiple Choice

Mercury is pockmarked with meteorite craters, while the Earth is not. Why?

• A) The Earth is farther from the Sun than Mercury.
• B) Tectonic activity and erosion have obliterated the craters on Earth.
• C) The Earth's surface was liquid when the great meteorite showers fell.
• D) Meteorites did not strike Earth.

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Definitions:

Eardrum

A thin membrane that separates the outer ear from the middle ear and vibrates in response to sound waves.

Olfactory Neurons

Sensory cells located in the nasal cavity that are responsible for the detection of odor molecules, leading to the sense of smell.

Human Olfactory System

Pertains to the bodily structures and processes involved in the sense of smell in humans.

Olfactory Epithelium

Two 1-square-inch patches of tissue, one at the top of each nasal cavity, which together contain about 10 million olfactory neurons, the receptors for smell.