Layers of the Earth and Their Role in Plate Tectonics

The video explains plate tectonics, focusing on Earth's layers: core, mantle, and crust. It details the core's iron composition, the thin crust's types, and the mantle's role. The asthenosphere's plasticity allows lithosphere plates to float, leading to isostasy. Seismic waves help study Earth's structure, revealing the Moho boundary. The video concludes with Earth's surface dynamics and encourages further learning.

What are the primary compositional layers of the Earth?

• Mantle, Crust, Lithosphere

• Core, Mantle, Crust

• Inner Core, Outer Core, Crust

• Lithosphere, Asthenosphere, Crust

What is the main composition of the Earth's core?

• Silicon

• Iron

• Nickel

• Magnesium

How does the thickness of the Earth's crust compare to its radius?

• 1/10 of the radius

• 1/50 of the radius

• 1/128 of the radius

• 1/200 of the radius

What type of crust is denser and thinner?

• Asthenospheric crust

• Lithospheric crust

• Oceanic crust

• Continental crust

What is the asthenosphere's role in plate tectonics?

• It is a plastic layer that allows the lithosphere to move.

• It is a solid layer that forms the mantle.

• It is a liquid layer that forms the core.

• It is a rigid layer that supports the crust.

What is the lithosphere composed of?

• Only the mantle

• Crust and upper mantle

• Core and mantle

• Only the crust

What is the process called when the lithosphere sinks into the asthenosphere?

• Isostasy

• Erosion

• Convection

• Subduction

How do scientists study the internal structure of the Earth?

• By measuring surface temperatures

• By using seismic waves

• By drilling deep into the Earth

• By observing volcanic eruptions

What is the Moho boundary?

• The boundary between the inner and outer core

• The boundary between the crust and the mantle

• The boundary between the lithosphere and asthenosphere

• The boundary between the mantle and the core

What happens to the Earth's crust when material is eroded from mountain tops?

• The crust sinks

• The crust rises

• The crust expands

• The crust remains unchanged