Briefly describe the two main lines of evidence for the modern theory of the moon's formation, wherein the Earth was hit by an approximately Mars-sized object
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The moon's composition is similar to the light rocks from the Earth's upper layers, and it has a low amount of water (which would have been vaporized in the impact).
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Why were Galileo's telescopic observations of the phases of Venus critical evidence in favor of the Copernican theory?
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The number 0.003010 has
A) 7 significant figures. B) 6 significant figures. C) 4 significant figures. D) 2 significant figures.
Dr. Chuck projects a ball horizontally from a lab bench. If the projection speed of the ball were greater, the time in the air would be
A) less. B) the same. C) greater.
Stromatolites are
A) fossils of the first organisms to introduce oxygen into the atmosphere B) fossils of the first multicellular organisms C) layers of sediment that once contained colonies of ancient microbes D) fossils of the first eukaryotes