Oxygen accounts for approximately ________ % of the air that surrounds us.
What will be an ideal response?
21.0
Physics & Space Science
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Galileo believed that motion stops in the absence of a force
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
A hydrogen atom consists of an electron and a(n)
A) proton. B) ion. C) neutrino. D) neutron. E) lepton.
Physics & Space Science
The intensity of cosmic rays bombarding the Earth's surface is greatest at
A) the poles. B) mid-latitudes. C) the equator. D) no particular locations.
Physics & Space Science
Why is the sky blue?
a. Because it reflects the ocean. b. Because water droplets refract the light. c. Because blue light is scattered more than red light by atmospheric molecules. d. Because blue is the complementary color to the yellow Sun. e. Because dust particles in the air scatter different colors of light differently.
Physics & Space Science