Theory of Plate Tectonics review

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What is the Theory of Plate Tectonics?

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The Theory of Plate Tectonics explains that the Earth's outer shell (lithosphere) is divided into several plates that glide over the semi-fluid asthenosphere beneath. This movement causes geological phenomena such as earthquakes, volcanic activity, and the formation of mountains.

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What causes the movement of tectonic plates?

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The movement of tectonic plates is primarily caused by convection currents in the asthenosphere, which is the semi-fluid layer of the Earth's mantle.

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What is a Convergent Boundary?

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A Convergent Boundary is a type of plate boundary where two tectonic plates move towards each other, often resulting in one plate being forced below the other, leading to subduction.

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What is a Divergent Boundary?

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A Divergent Boundary is a type of plate boundary where two tectonic plates move away from each other, allowing magma to rise and create new crust, often seen at mid-ocean ridges.

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What is a Transform Boundary?

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A Transform Boundary is a type of plate boundary where two tectonic plates slide past each other horizontally, which can cause earthquakes.

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What is a Volcano?

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A Volcano is an opening in the Earth's crust through which hot molten rock (magma) and gases escape from the Earth's interior.

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What is the Asthenosphere?

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The Asthenosphere is a semi-fluid layer of the Earth's mantle located beneath the lithosphere, where convection currents occur, driving the movement of tectonic plates.

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What is subduction?

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Subduction is the process by which one tectonic plate is forced under another plate into the mantle, often leading to volcanic activity and the formation of deep ocean trenches.

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What geological features can form at Convergent Boundaries?

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At Convergent Boundaries, geological features such as mountain ranges, deep ocean trenches, and volcanic arcs can form due to the collision and subduction of tectonic plates.

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What is the significance of Earth's magnetic North Pole in plate tectonics?

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The apparent changes in the position of Earth's magnetic North Pole, recorded in igneous rocks, provide evidence for the movement of tectonic plates over geologic time.