Carbonaceous chondrites are meteorites that have
a. never been melted since formation from solid particles in the solar nebula.
b. totally melted after formation.
c. been made from hydrogen and helium.
d. never entered Earth's atmosphere.
e. entered Earth's atmosphere but will be destroyed before reaching the ground.
a
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The cycle of nitrogen at Triton's north pole resembles in some ways the cycle of carbon dioxide on _______________
Fill in the blank(s) with correct word
The three major processes that heat the interiors of the terrestrial worlds are
A) (1) heat deposited as the planets were built from planetesimals (2) heat deposited as the planets underwent differentiation (3) heat released by radioactive decay. B) (1) heat deposited as the planets were built from planetesimals (2) heat of accretion (3) heat that came from the gravitational potential energy of incoming planetesimals. C) (1) heat of accretion (2) heat from convection (3) heat from thermal radiation. D) (1) volcanism (2) tectonics (3) erosion.
The SI unit of frequency is ______________
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Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
A) insulators. B) conductors. C) semiconductors. D) superconductors. E) polar.