Why Are Ancient Impact Craters Difficult to Identify on Earth

question 6

Multiple Choice

Why are ancient impact craters difficult to identify on Earth?

• A)they typically have been eroded or infilled with younger sediments
• B)impact craters on Earth are smaller than those on the Moon or Mars
• C)they typically lack shock metamorphic minerals
• D)there have been very few meteorite impacts on Earth

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Definitions:

Electrons

Particles within atoms that carry a negative electrical charge and serve as the main conductors of electrical current in solids.

Covalent Bonds

A type of chemical bond involving the sharing of electron pairs between atoms, which results in a stable balance of attractive and repulsive forces between atoms.

Atom

The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, with electrons orbiting around it.

Substance

A form of matter with a specific chemical composition and set of properties that distinguish it from other forms of matter.