Which of the following best explains why rocks can be used to interpret the geologic past?
A. The minerals in rocks tell us how old rocks are.
B. The hardness of rocks tells us how old they are.
C. Rocks contain varying amounts of carbon.
D. The chemical composition of rocks tells us how old they are.
E. Different types of rocks form in different types of environments.
Answer: E
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Which of the following occurs when frost forms?
A. Frost forms through sublimation. B. The dew point is above 0ºC. C. Objects on the ground cool above the dew-point temperature. D. Water vapour changes into ice without first becoming a liquid.
What determines the number and composition of the populations in a community?
A) Food B) Light C) Space D) All of these choices
Middle-range forecasting has a serious loss of accuracy after about
A) three days. B) seven days. C) 14 days. D) 20 days.
The Midwest's winter precipitation is chiefly attributable to ____
a. the interaction of contrasting air masses b. orographic factors c. friction of the air with rough surfaces d. sun control of air temperature