The sedimentary environment from which coal most commonly is derived is ____
a. desert
b. shallow marine
c. swamp
d. Arctic
e. organic reef
c
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What property primarily determines the effect of temperature on the solubility of gas molecules?
A. the kinetic energy of the gas B. the ionic strength of the gas C. the dipole strength of the solvent D. the molecular weight of the gas E. the polarity of the gas
With a sketch, show why the setting sun often appears red to an observer on the ground. Why does the sun appear white at noon and red at sunrise and sunset?
What will be an ideal response?
Parallels have often been used to demarcate political boundaries. The 49th parallel north forms a portion of the border between which two countries?
What will be an ideal response?
A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of the above