Use the following diagram to answer this question.
These are mostly made of rock and/or metal.
A. Comets only
B. Comets and asteroids
C. Asteroids only
D. Neither asteroids nor comets
Answer: C
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Homo sapiens have inhabited Earth for fewer than 250,000 years
a. True b. False
A naturally occurring substance that seeps up from the ground and that is potentially toxic to people is ________
A) radon gas B) carbon dioxide C) bisphenol A D) DDE E) Salmonella
NEO hunters are not actively searching for smaller objects that could destroy entire cities, but instead are focused on detecting larger objects that could threaten entire countries or continents.
Answer the following statement true (T) or false (F)
Assume that water filling a crack in a rock undergoes cycles of freezing and melting. Which of the following statement is true?
a. Water shrinks as it melts, causing the crack walls to be pulled closer together. b. Water expands as it melts, causing the crack walls to be pushed apart. c. Water shrinks as it freezes, causing the crack walls to be drawn closer together. d. Water expands as it freezes, causing the crack walls to be pushed apart.