Magnetic reversals ____
A)occur in a matter of months
B)occur when magnetic north and magnetic south poles switch positions
C)have no affect on iron-bearing minerals
D)are very well understood and can be predicted
E)cause seafloor spreading to reverse directions
B
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Which of the following substances is pure?
A. an element B. an ionic compound consisting of sodium and chlorine ions C. a covalent compound consisting of one type of molecule D. all of the above E. none of the above
The surface of the Earth can be divided into land (30%) and ocean (70%). The deepest point on the ocean floor is the Challenger Deep, and the highest point on land is Mt. Everest.
a. true b. false
Which chemicals make plastics more flexible and are found in a variety of products, such as detergents, cosmetics, body lotions, soft vinyl toys, and shower curtains?
A. carcinogens B. phthalates C. estrogens D. androgens E. BPAs
Water evaporated from the ocean surface is moved by ____
a. cold fronts b. wind c. precipitation d. climate e. condensation