An icy leftover planetesimal orbiting the Sun is called a(n)
A) comet.
B) moon.
C) asteroid.
D) meteorite.
A) comet.
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Volcanism is more likely on a planet that
A) is closer to the Sun. B) is struck often by meteors and solar system debris. C) has high internal temperature. D) doesn't have an atmosphere or oceans.
As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as
a. ionization. b. isotropy. c. annihilation. d. recombination. e. hydration.
The component in CFCs that is responsible for destroying ozone is ______________
Fill in the blank(s) with correct word
A 15-?F capacitor and a 25-?F capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energy is then stored in this capacitor combination?
a. 50 mJ b. 18 mJ c. 32 mJ d. 72 mJ e. 45 mJ