The Terrestrial Planets Are Made Almost Entirely of Elements Heavier

question 18

Multiple Choice

The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium.According to modern science,where did these elements come from?

• A)They were produced by stars that lived and died before our solar system was born.
• B)They were produced by gravity in the solar nebula as it collapsed.
• C)They have been present in the universe since its birth.
• D)They were made by chemical reactions in interstellar gas.

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Definitions:

Returns To Scale

A concept in economics that describes the change in output as a result of a proportional change in all inputs.

Input

Resources used in the production process, including labor, materials, and capital.

Production Function

A production function describes the relationship between inputs utilized in production and the output generated from those inputs.

Returns To Scale

The rate at which production output increases as a result of a proportional increase in all inputs (labor, capital, etc.).