Despite varying masses, all spiral galaxies look essentially the same
Indicate whether the statement is true or false
FALSE
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Approximately how long after the Solar System formed did it take for oxygen to get to within 80 percent of its present abundance in Earth's atmosphere?
a. 4 billion years b. 1 billion years c. 400 million years d. 1 million years e. Oxygen was always a primary component of Earth's atmosphere.
Evaluate the evidence that Mars had a liquid water past
What will be an ideal response?
Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 × 10^-31 kg, ke = 8.99 × 10^9 N×m2/C2, G = 6.67 × 10^-11 N×m2/kg2, and e = 1.6 × 10^-19 C)
a. 1.3 × 10^20 c. 2.3 × 10^2 b. 4.2 × 10^42 d. 3.1 × 10^22
How is the Moon's crust similar to Earth's?
A. New lunar crust is forming at plate boundaries. B. The lunar crust is thicker on one side than the other. C. Volcanic activity produced most of the craters on the Moon. D. The lunar crust is mostly silicate rock. E. All of these choices are correct.