Ripples in the Cosmic Microwave Background correspond to:
A) matter density fluctuations.
B) temperature fluctuations.
C) energy fluctuations.
D) fluctuations in both matter and radiation.
E) imperfections in measurement techniques or equipment.
D
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Rocks solidified from molten material, either below or above ground, are classified as ______________ rocks
Fill in the blank(s) with correct word
Why do we have seasons on Earth?
a) Season are caused the Sun moving through the constellations of the zodiac b) the spin axis of the Earth titled 23.5 with respect to a line normal to the plane of orbit c) the earth's distance from the Sun varies, so that it is summer the we are closer to the Sun and winter when we are farther from the Sun The spin axis of the Earth is titled 23.5 with respect to a line normal to the plane of orbit
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the Earth's surface. B) the temperature of the upper atmosphere is higher than it is at the Earth's surface. C) the sunlight travels over a longer path at the horizon, resulting in more scattering. D) none of the given answers
Briefly describe the modern theory of how our Moon formed
What will be an ideal response?