Like other solid bodies in the solar system, Earth's surface was kept molten by:
A) radioactivity.
B) differentiation.
C) convection.
D) bombardment by small bodies.
E) the solar nebula.
D
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Projectile Motion: A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance?
A. 6.1 m/s B. 7.4 m/s C. 8.1 m/s D. 8.9 m/s
How can a volcanic eruption affect weather?
What will be an ideal response?
In the riddle, what is meant by light leaving its trap?
A: Light travelled much slower than the speed of light after the time of nucleosynthesis. B: Light was stuck to the matter concentrations by the force of gluons. C: Black holes prevented light from escaping in the early universe until after recombination. D: The universe was opaque until atoms formed and radiation could travel freely through space. E: The electromagnetic force held light in its place since light has an opposite charge to matter.
The main way astronomers determine the physical and chemical properties of an object in the distant universe is through
A) photography B) spectroscopy C) astrometry D) direct measurement