How many neutrons are in a 35Cl nucleus?
A. 17
B. 18
C. 16
D. 19
B. 18
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Which of the following can act like a long-term "thermostat" that helps keep Earth's average temperature fairly stable?
A) radioactive elements trapped in the Earth's mantle B) heat stored in the Earth's magnetosphere C) heat stored in the Earth's liquid core D) the carbon dioxide cycle that moves carbon dioxide between Earth's atmosphere, oceans, and rock
Why does the Moon have a layer of powdery "soil" on its surface?
A) Large impacts shattered lunar rock to make this soil. B) The soil exists because the Moon accreted from powdery material after a giant impact blasted Earth. C) Volatiles escaping from the Moon's interior bubble upward and make the soil. D) The soil is the result of the same processes that make powdery sand on Earth. E) It's the result of gradual erosion by micrometeorites striking the Moon.
The Sun is a(n) ______________
Fill in the blank(s) with correct word
The number of stars in the Milky Way Galaxy is approximately ________
A) a few hundred million B) a few hundred billion C) a few hundred D) a few hundred thousand