Igneous rock is formed from
A) crystallization of molten magma.
B) high temperatures and pressures.
C) solidified lava beneath the Earth's surface.
D) any of these
Answer: A
Physics & Space Science
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A helium atom with only one neutron in its nucleus is called ________.
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The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. D E. C and D
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No visible light can escape a black hole, but things such as gamma rays, X-rays, and neutrinos can
Indicate whether the statement is true or false
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The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
A) 0.43 B) 2.3 C) 0.65 D) 2.0
Physics & Space Science