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
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
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.