The major chemical component of the air we breathe today was deposited on Earth primarily via
a. volcanic eruptions.
b. cometary impacts.
c. asteroid impacts.
d. chemical reactions in Earth's oceans.
b. cometary impacts.
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
How do earthquakes allow us to model the structure of Earth's core?
What will be an ideal response?
A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
A) 20 cm B) 30 cm C) 50 cm D) 70 cm E) 90 cm
What is the definition of heat capacity?
a. The amount of heat that raises one gram of water one degree Celsius. b. The amount of heat that raises the temperature of an object one degree Celsius. c. The amount of heat an object can stand before it burns up. d. The maximum amount of heat an object can hold. e. The amount of heat an object can pass to a cooler object.