Galileo's observations of a complete set of phases of Venus proved
a. that Venus orbited the Sun.
b. that Earth orbited the Sun.
c. that all of the planets orbited the Sun.
d. that the Moon orbited Earth.
e. that Venus had an atmosphere.
a
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_________hardening is the least expensive process for strengthening metals, because no expensive alloy elements are added, and it is only necessary to deform the metal with standard deformation processes.
Fill in the blank(s) with the appropriate word(s).
Which of the following best summarizes what we mean by dark matter?
A) matter that we have identified from its gravitational effects but that we cannot see in any wavelength of light B) matter that may inhabit dark areas of the cosmos where we see nothing at all C) matter consisting of black holes D) matter for which we have theoretical reason to think it exists, but no observational evidence for its existence
Watts per square meter is a unit for measuring the ______________ of a sound wave
Fill in the blank(s) with correct word
During the Mesozoic, the supercontinent of Laurasia fragmented into the continents of
A) North America, Europe, and Asia. B) South America, Africa, Antarctica/Australia, and India/Madagascar. C) North America, Europe, and Africa. D) South America, Australia, and Antarctica.