Plate Tectonics Discoveries

What observation first intrigued Alfred Wegener about the distribution of fossils?

• The presence of identical plant and animal fossils on opposite sides of the Atlantic Ocean.

• The discovery of ancient human settlements in unexpected locations.

• The unusual shapes of clouds over the ocean.

• The consistent depth of the ocean floor across vast distances.

What name did Alfred Wegener give to the single giant landmass he believed once existed, and what was his theory called?

• Gondwana, Plate Tectonics

• Laurasia, Continental Movement

• Pangaea, Continental Drift

• Atlantis, Landmass Separation

Why was Alfred Wegener's theory of Continental Drift initially largely ignored by his peers?

• He lacked sufficient fossil evidence to support his claims.

• He could not explain the mechanism by which continents moved.

• His maps of the continents were inaccurate.

• Other scientists had already proposed a similar theory with more evidence.

What surprising feature did Harry Hess discover about the Pacific Ocean floor during World War II?

• It was completely flat and covered in a thick layer of sediment.

• It contained vast, unexplored underwater cities.

• It was characterized by mountains, canyons, trenches, and volcanic peaks.

• It was much shallower than previously thought.

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What did Harry Hess discover about the age of the Atlantic Ocean floor?

• It was getting younger closer to the ridge.

• It was progressively older the further it moved from the ridge.

• It was stationary and unchanging.

• It was sinking uniformly across the ocean basin.

What is the process called when the Earth's crust is recycled back into the Earth's interior?

• Seafloor spreading

• Continental drift

• Subduction

• Volcanism

At what approximate rate do the Earth's tectonic plates move annually?

• Several meters

• At the speed of a fast-moving river

• A few centimeters

• Several kilometers

What geological feature commonly forms where one tectonic plate is subducted beneath another, leading to the release of water that lowers the melting temperature of the overriding plate?

• Mid-ocean ridges

• Strike-slip faults

• Volcanoes

• Deep ocean trenches