Earth has gone in and out of numerous ice ages over the past couple million years. Which of the following was generally true during all those ice ages?
A) The atmospheric carbon dioxide concentration was much higher than it is today.
B) The atmospheric carbon dioxide concentration was much lower than it is today.
C) The continents were closer together than they are today.
D) The continents were farther apart than they are today.
E) There were much larger mammals than there are today.
B) The atmospheric carbon dioxide concentration was much lower than it is today.
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The ____________________ is the point on the celestial sphere directly above an observer, regardless of where the observer is located on Earth
Fill in the blank(s) with correct word
During which step in cosmic evolution did diverse life forms begin to arise?
A) particulate evolution B) stellar evolution C) chemical evolution D) biological evolution E) cultural evolution
If ? 1 = 4.0 V, ? 2 = 12.0 V, R1 = 4 ?, R2 = 12 ?, C = 3 ?F, Q = 18 ?C, and I = 2.5 A, what is the potential difference Va ? Vb?
a.
?30 V
b.
30 V
c.
5.0 V
d.
?5.0 V
e.
?1.0 V
Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the
A) black surface. B) white surface. C) neither, as no noticeable difference.