Exploring Plate Tectonic Movement Mechanisms

The video explains the theory of plate tectonics, a relatively young scientific theory that describes the movement of Earth's lithosphere on the asthenosphere. It covers the three main mechanisms driving plate movement: convection cycles, slab pull, and ridge push. Convection cycles involve the movement of hot mantle material, while ridge push and slab pull are influenced by gravity and density differences. The video also discusses the formation of new crust at divergent boundaries and the recycling of oceanic crust at subduction zones, highlighting the age differences between oceanic and continental crusts.

What is the primary theory explaining the movement of Earth's plates?

• Continental drift

• Plate tectonics

• Earth's rotation

• Solar influence

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NGSS.HS-ESS1-5

Which of the following is NOT a mechanism that drives plate tectonics?

• Convection cycles

• Slab pull

• Ridge push

• Tidal forces

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NGSS.HS-ESS1-5

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What does the asthenosphere primarily consist of?

• Solid rock

• Liquid magma

• Gaseous materials

• Semi-molten rock

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NGSS.HS-ESS2-3

At what type of boundary is new crust typically formed?

• Subduction zone

• Transform boundary

• Divergent boundary

• Convergent boundary

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NGSS.HS-ESS2-1

What role does gravity play in the movement of tectonic plates at divergent boundaries?

• It pulls plates together

• It has no effect

• It pushes plates apart

• It stabilizes the plates

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NGSS.HS-ESS1-5

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What happens when one tectonic plate subducts beneath another?

• It leads to the formation of mountain ranges

• It forms a new crust

• It causes a volcanic eruption

• It stabilizes the Earth's crust

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

Which type of crust is generally older?

• Neither; they renew constantly

• Oceanic crust

• Continental crust

• Both are the same age

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What is the approximate age of the oldest continental crust found on Earth?

• 180 million years

• 4.3 billion years

• 1 billion years

• 500 million years

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NGSS.HS-ESS1-5

How does the density of oceanic crust compare to continental crust?

• More dense

• Less dense

• Same density

• Density varies widely

What geological feature is formed by the subduction of oceanic crust beneath continental crust?

• Oceanic trench

• Volcanic island

• Rift valley

• Mountain range

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1