Exam 3: Drifting Continents and Spreading Seas

The map below depicts earthquakes,which on the ocean floor coincide most often with

According to the figure below,the Earth's magnetic poles move constantly.About how far from the geographic poles do the magnetic poles move?

________ proposed the continental-drift hypothesis,suggesting that the arrangement of continents on the planet has changed over geologic time.

Evidence of paleomagnetism can be found in

Evidence that glaciers once covered an area might include

Volcanoes that are submerged beneath the surface of the sea are termed

What does an ordinary compass indicate?

Continents passively move apart as a result of __________,and they passively move together as a result of __________.

Currently,most geologists

Limestone reefs and salt deposits are important in the reconstruction of the Earth's history because they

Deep-ocean trenches are found predominantly along the perimeter of the

If a geologist discovered coal in a modern-day cold,snowy location,he or she could conclude that

The thickness of clay and planktonic microskeletons is greatest

Evidence that the South American and African continents were once joined includes evidence from their coastlines such as

With increasing distance from a mid-ocean ridge,the age of oceanic crust

Why wasn't Wegener's theory of continental drift originally accepted by geologists of his time?

According to the figure below,what can be said about the ocean sediments at location B relative to location D?

Seafloor spreading is driven by volcanic activity

How does the observed pattern of marine magnetic anomalies form,and how does its existence help prove plate tectonics?

A great boost in seafloor exploration and a greater understanding of seafloor bathymetry were a result of