What period of Earth's geologic history saw a dramatic increase in life?
a. Cretaceous
b. Devonian
c. Jurassic
d. Tertiary
e. Cambrian
e
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The Big Bang is a theory describing the ____
a. birth of our Solar System b. start of civilization on Earth c. beginning of planet formation d. beginning of the Universe e. massive extinction of dinosaurs
What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance. B) There was no material to create planetesimals beyond the orbit of Neptune. C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away. D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters. E) There may be, but they would be so faint that astronomers have not found them yet.
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into a disk?
A) They are light enough that they have expanded out into the halo. B) WIMPs were produced at the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed at the beginning of the galaxy. C) Since they do not interact with the electromagnetic force, they do not feel friction or drag and hence do not contract with the rest of the protogalactic cloud. D) Shock waves from supernovae have blown the WIMPs out into the halo. E) Jets from the early active stage of a galaxy's life shot out most of the WIMPs from the disk.
"Pressure applied to an enclosed fluid is transmitted to every point in the fluid and to the enclosure walls" is known as
A) Archimedes' principle. B) Bernoulli's principle. C) Kepler's law. D) Pascal's principle. E) Fermet's principle.