A continental ice sheet once covered most of Canada
Indicate whether the statement is true or false
TRUE
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Refraction occurs when light passing from one medium to another
A. loses energy. B. changes frequency. C. changes form. D. none of the above
The sea is salty because
A. the mantle is salty. B. rainwater is salty. C. marine organisms manufacture salts. D. it contains salts from Earth's crust that have been dumped into the ocean and dissolved.
Which of the choices below is a feature of the oceanic ridge system?
a. a transform fault b. the destruction of lithosphere c. a mountain range d. a rift valley e. a deep-sea trench
Water vapor is nearly absent in ________
A) the upper reaches of the atmosphere B) the lower reaches of the atmosphere C) the troposphere D) the atmosphere over sea surfaces E) the atmosphere over land surfaces