CPSB Plate Motion 25-26 CRITICAL JUNCTURE

Front

What is the theory of plate tectonics?

Back

The theory of plate tectonics explains the movement of Earth's lithosphere, which is divided into tectonic plates that float on the semi-fluid asthenosphere beneath them. This movement is responsible for many geological phenomena, including earthquakes, volcanic activity, and the formation of mountains.

Front

What evidence supports the theory of continental drift?

Back

Fossil evidence, such as similar species found on different continents, geological formations, and the fit of continental shapes, supports the theory of continental drift.

Front

What is continental drift?

Back

Continental drift is the hypothesis that continents have moved over geological time and were once joined together in a single landmass called Pangaea.

Front

What is seafloor spreading?

Back

Seafloor spreading is the process by which new oceanic crust is formed at mid-ocean ridges and older crust moves away from the ridge, driven by convection currents in the mantle.

Front

What role do convection currents play in plate tectonics?

Back

Convection currents in the mantle cause the movement of tectonic plates. Hot material rises, cools, and then sinks, creating a cycle that pushes plates apart or pulls them together.

Front

What is the significance of fossil evidence in geology?

Back

Fossil evidence helps geologists understand the historical distribution of species and supports theories like continental drift by showing how similar species existed on now-separated continents.

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How do the shapes of continents support the theory of plate tectonics?

Back

The shapes of continents, such as the fit of South America and Africa, suggest they were once connected, supporting the idea of continental drift and plate tectonics.

Front

What is a tectonic plate?

Back

A tectonic plate is a large, rigid slab of Earth's lithosphere that moves and interacts with other plates, leading to geological activity.

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 seafloor spreading.

Front

What is a transform boundary?

Back

A transform boundary is a tectonic plate boundary where two plates slide past each other horizontally, causing earthquakes.