Plate Tectonics, Earthquakes, and Volcanoes - Flashcard #1

Front

What is the Theory of Continental Drift?

Back

The Theory of Continental Drift suggests that continents were once part of a single landmass called Pangaea, which broke apart and drifted to their current locations.

Front

Why was Wegener's theory initially not accepted?

Back

Wegener's theory was not accepted because he could not explain HOW the continents moved.

Front

What is a divergent boundary?

Back

A divergent boundary is a tectonic plate boundary where two plates move away from each other, often resulting in the formation of new oceanic crust.

Front

What geologic feature is commonly found at a divergent boundary between oceanic crust?

Back

A Mid-Ocean Ridge is commonly found at a divergent boundary between oceanic crust.

Front

Which continents fit together like puzzle pieces?

Back

South America and Africa fit together most noticeably.

Front

What evidence did Wegener use to support his theory of continental drift?

Back

Wegener used the shape of the continents, similar fossils found on separate continents, and tree fossils found in odd places as evidence.

Front

What is a tectonic plate?

Back

A tectonic plate is a large, rigid piece of the Earth's lithosphere that moves and interacts with other plates.

Front

What is the difference between oceanic and continental crust?

Back

Oceanic crust is thinner and denser than continental crust, which is thicker and less dense.

Front

What is a convergent boundary?

Back

A convergent boundary is where two tectonic plates collide, often leading to the formation of mountains or subduction zones.

Front

What is subduction?

Back

Subduction is the process where one tectonic plate moves under another and sinks into the mantle.