The video reviews the layers of the Earth, including the crust, mantle, outer core, and inner core. It explains the relative thickness of these layers using the analogy of a hardboiled egg. The video also discusses how geologists explore the Earth's interior through rock samples and seismic waves, despite never having dug deeper than the crust. Seismic waves provide indirect evidence of the Earth's internal structure by showing how they bend and change speed when passing through different materials.

Which layer of the Earth is the outermost and the one we walk on?

• Inner Core

• Outer Core

• Crust

• Mantle

What is the thickest layer of the Earth?

• Inner Core

• Outer Core

• Mantle

• Crust

What is the Earth's crust compared to in the analogy with a hardboiled egg?

• The yolk

• The white part

• The shell

• The entire egg

Which part of the hardboiled egg represents the Earth's mantle?

• The yolk

• The entire egg

• The white part

• The shell

How deep have humans been able to dig into the Earth's crust?

• 100 miles

• 62 miles

• 200 miles

• 7 miles

What natural forces can bring rocks from deep within the Earth to the surface?

• Hurricanes

• Tsunamis

• Earthquakes and faults

• Volcanoes

What type of evidence do geologists use to study layers deeper than the crust?

• Experimental evidence

• Visual evidence

• Indirect evidence

• Direct evidence

Tags

NGSS.MS-ESS2-2

What do seismic waves do when they travel through different layers of the Earth?

• They bend

• They speed up uniformly

• They disappear

• They stop

What are primary seismic waves also known as?

• P waves

• S waves

• Rayleigh waves

• Surface waves

What happens to secondary seismic waves when they hit a certain layer they cannot pass through?

• They speed up

• They slow down

• They bounce back

• They disappear