The fourth planet from the Sun is ______________
Fill in the blank(s) with correct word
Mars
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According to the nebular theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because only metal and rock could condense in the inner solar system, whereas ice also condensed in the outer solar system B) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system D) because only the outer planets captured hydrogen and helium gas from the solar nebula
The Hubble time is
a. the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the universe stops expanding and begins to contract. e. an estimate of the age of the universe based on the Hubble constant.
Blowing sand in a sand dune, settles
A) on the windward slope of the dune. B) on the leeward slope of the dune. C) on surrounding mounds of vegetation. D) in the wind shadow of the leeward slope.
pH measures
What will be an ideal response?