Earth's early life forms were marine organisms. Life moved to the land during the
A) Cambrian period.
B) Ordovician period.
C) Silurian period.
D) Triassic period.
Answer: C
Physics & Space Science
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Mercury's major atmospheric gas is
a. oxygen. b. hydrogen. c. carbon dioxide. d. Misleading; the atmosphere is virtually nonexistent.
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Most galaxies are spirals
Indicate whether the statement is true or false
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A solid solution of two or more metals is called a(n) ______________
Fill in the blank(s) with correct word
Physics & Space Science
With molar quantity and temperature held constant, by what factor does the pressure of an ideal gas change when the volume is four times bigger?
a. 16 c. 1/4 b. 4 d. 1/16
Physics & Space Science