What was the main reason scientists objected to Alfred Wegener's idea of continental drift?
Wegener's proposed mechanism for movement was thought to violate the laws of physics.
As a tool, paleomagnetism is a piece of modern evidence that has helped support plate tectonics by showing that ________________.
magnetic sea floor "stripes" are symmetric with respect to the mid-ocean ridge
How is it that the floor of the ocean is so much younger than the ocean itself?
The ocean floor keeps regenerating itself.
The faster the rate of spreading at the mid-ocean ridge or rise, the ________ the underwater volcanic mountain range.
The Hawaiian Islands are associated with which type of plate boundary?
none of the above (The Hawaiian Islands are not associated with any plate boundary.)
What happens when two continental plates converge?
Neither subducts; instead, a mountain range forms.
Your job is to locate the world's plate boundaries. To do this, you may use only one map. The best map to choose for this job is a map that shows the worldwide locations of ___________________.
How much wider is the Atlantic Ocean today than when Christopher Columbus sailed? Assume that the Atlantic Ocean is getting wider at a rate of 3 centimeters per year (about 1 inch). (Round off the dates to the nearest century to make the calculation simpler.)
15 meters (about 49 feet)
Along which of the following would you NOT expect to find active volcanic activity?
continental collision zone
Which of the following tropical islands would likely be the youngest?
tropical island without a fringing reef
What best describes the tectonic setting of the Cascade Mountains of the Pacific Northwest?