Earth's secondary atmosphere occurred when _____________ was added to the carbon dioxide, water vapor, and nitrogen mix by plant life, and _____________ was removed from the carbon dioxide, water vapor, and nitrogen mix by dissolution in seawater
Fill in the blank(s) with correct word
oxygen, carbon dioxide
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The cosmological principle states that any observer in any galaxy will see the same general features of the Universe
a. True b. False Indicate whether the statement is true or false
Coulomb's Law: Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?
A. A B. B C. C D. D
Olbers's paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) Why is the sky dark at night? B) What would it be like to ride on a beam of light? C) How many stars are in the universe? D) Can we measure the position and momentum of an electron at the same time?
The color of the powder of a mineral is known as the mineral's
a. index of refraction. b. hardness. c. specific gravity. d. streak.