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) Unusually large abundances of iridium and other rare metals are found in a layer of clay that dates to 65 million years ago.
C) A large impact crater along the coast of Mexico 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) Fossilized dinosaur bones contain fragments of rock from the impact.
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In brittle ceramics, the fracture strength is lower than the _________strength.
Fill in the blank(s) with the appropriate word(s).
Explain why, in space, "no one can hear you scream."
What will be an ideal response?
A neutron is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) none of the above.
A barbell is easier to twist when its weights are
a. close to the axis of rotation b. near the ends of the bar c. heavy d. light e. none of the above