We know that Earth has water. However, according to our theory of solar system formation, the inner solar system was too hot for hydrogen compounds like water to condense. What do we conclude?
A) Water arrived on Earth at a time when it rained throughout the inner solar system.
B) Earth's water likely was brought here by asteroids or comets that formed beyond the frost line.
C) Our theory of solar system formation will need modification because it is unable to account for the existence of water on Earth.
D) Earth's water probably originated through chemical reactions among the rock and metal of Earth's interior.
A) Water arrived on Earth at a time when it rained throughout the inner solar system.
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A mercury-in-glass thermometer reads an outside temperature of 20ºC. If the sky and surroundings of the thermometer have an average surface temperature of 5ºC, estimate the net radiation per unit area from or to the thermometer.
What will be an ideal response?
What stage of star formation is ZAMS?
What will be an ideal response?
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 16-1. The point at which the object has zero velocity and positive acceleration is
A. A B. B C. C D. D E. E
The asteroid that killed the dinosaurs exploded because
A. it was made of explosive material B. it was made out of U-235 C. it got very hot from the impact D. It didn't explode; it knocked the Earth out of its normal orbit.