Which of the following is not a piece of evidence supporting the idea that an impact caused the mass extinction that occurred 65 million years ago?
A) Fossilized dinosaur bones contain fragments of rock from the impact.
B) A large impact crater along the coast of Mexico dates to 65 million years ago.
C) Unusually large abundances of iridium and other rare metals are found in a layer of clay that dates to 65 million years ago.
D) Grains of quartz formed under high pressure are found in a layer of clay that dates to 65 million years ago.
A
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The cosmic background radiation comes from a time after the origin of the universe
a. when protons and neutrons were first formed. b. when the big bang first began to expand. c. the inflationary period. d. when gamma rays had enough energy to destroy nuclei. e. when electrons began to recombine with nuclei to form atoms.
The concept that on the grandest of scales, the universe is similar in appearance everywhere is:
A) special relativity. B) general relativity. C) homogeneity. D) isotropy. E) universality.
Rising air expands and cools. If the air mass cools below its dew point temperature, the air mass
A) reaches 100% relative humidity, and water vapor evaporates. B) reaches 100% relative humidity, and water vapor may condense to form clouds. C) stops moving upward and relative humidity climbs to 100%. D) continues to cool at the environmental lapse rate.
The type of smog that forms in Los Angeles is called ______________ smog
Fill in the blank(s) with correct word