The actual amount of time it takes for Earth to rotate 360° on its axis is called a
a. meridian day.
b. 24-hour day.
c. sidereal day.
d. mean solar day.
e. solar day.
c
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The ionosphere
A) is produced by the action of solar radiation and atmospheric atoms. B) consists of ozone ions. C) reflects solar ultraviolet and atmospheric atoms. D) occurs at roughly the same altitude as high clouds.
What is the major difference between asteroids and comets?
A) Asteroids are rocky and comets are icy. B) Asteroids are low in density and comets are high in density. C) Asteroids never have tails and comets always have tails. D) Asteroids are smaller than comets. E) Asteroids are larger than comets.
A cube of aluminum is at a depth of 1.000 km under seawater whose density is 
The bulk stress on the cube due to the seawater is
A. 
B. 
C. 
D. 
E. 
Passive heating measures are among the most expensive ways of heating spaces in buildings
What will be an ideal response?