Twenty kilometers is
a. 200,000 m.
b. 20,000 m.
c. 2,000 m.
d. 200 m.
e. 0.02 m.
b
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The observed evidence we have for black holes includes
A) X-rays that are thought to come from the center of a black hole. B) visible light that is thought to come from the center of a black hole. C) temperature measurement of certain extremely cold stars that are thought to be black holes. D) X-rays that are thought to come from gases that are outside of a black hole. E) observations of certain regions of space, larger than the largest known stars, that emit no light.
Convection currents in the ____________ cause lithospheric plates to move across the Earth’s surface.
Fill in the blank(s) with the appropriate word(s).
When a current is induced by a changing magnetic field B1, the current always produces a second magnetic field B2 such that
A. B1 and B2 completely cancel each other out. B. B1 and B2 combine to give a weaker magnetic field than B1 alone. C. B1 and B2 combine to give a stronger magnetic field than B1 alone. D. It is not possible to tell whether the combined field is stronger or weaker than B1 without knowing how B1 is changing
Alh 84001
a. is a meteorite that shows evidence for life evolving on Mars. b. is the compound used by Miller to begin his experiment to produce amino acids. c. is the amino acid produced in the Miller experiment. d. is the molecule that controls the reproduction of DNA within a cell e. is the molecule that acts as DNAs messenger that assembles proteins from amino acids.