Radiometric dating was used to age the ocean floor which was found to be older than the land at the
center of continents. Indicate whether the statement is true or false.
ANS: F
Radiometric dating is used to age the Earth's crust including the ocean floor. The oceanic crust,
however, is only dated to be 200 million years old, whereas, the continental crust is much older at 4
billion years old. This is due to the creation of new crust in the seafloor and the destruction of older
oceanic crust. Information can be found in the section Wegener's Idea Is Transformed.
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One cubic meter of which of these would weigh the most?
A) ocean water B) granite rock C) basaltic rock D) mantle
High grading can be defined as ________
A) a forest that has been largely unaffected by humans B) artificially or naturally reforested areas C) the loss of biodiversity of forest areas D) the natural frequency and severity of fires in a forest E) removal of particular species of trees for fuel and construction
The auroras are caused by charged particles originating from ____
A) Earth's atmosphere B) solar wind C) the North Pole D) the South Pole
Overrunning, the rising of warm air over cold air, is associated with: a. warm fronts
b. cold fronts. c. drylines. d. All of these choices.