Most Surface Rocks on Earth Are Younger Than a Few

question 270

Multiple Choice

Most surface rocks on Earth are younger than a few million years old, whereas ages of lunar rocks have been measured in billions of years. Why?

• A) Much of Earth's surface is continually recycled (created and subducted) by the underlying mantle because of plate tectonic activity; this process does not occur on the Moon.
• B) Most early surface rocks on Earth have been washed into the sea by weathering and rainwater; this process does not happen on the Moon.
• C) The complete surface of Earth has been covered periodically by younger material from intense volcanic eruptions in the last few million years; no such activity occurred on the Moon.
• D) The ages of Earth and the Moon are fundamentally different; the Moon is an old object captured from space by a younger Earth.

Grasp the concept of economies and diseconomies of scale and their implications on costs.

Comprehend the difference between the short run and the long run in production.

Calculate total revenue, total cost, and profit under different scenarios.

Distinguish between explicit and implicit costs and their relevance to economic and accounting profits.

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Definitions:

Young Child

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A developmental psychologist known for his theory on the psychosocial development of humans, identifying eight stages from infancy to adulthood.