Exploring the Forces Behind Plate Tectonics

The video explores the dynamics of plate tectonics, focusing on mantle convection, seafloor spreading, and the forces driving plate movements. It explains how ocean plates form and cool, leading to changes in ocean depth. The concepts of ridge push and slab pull are discussed as key forces in plate movement. The video also covers subduction zones and the occurrence of earthquakes, highlighting the role of plate density and temperature in these processes.

What was the early belief about what drove plate motions?

• Mantle convection below the tectonic plates

• Gravity-driven convection system

• Asthenosphere flow

• Subduction zones

Tags

NGSS.HS-ESS2-3

What is the depth of the ocean at a spreading ridge?

• 7000 meters

• 3000 meters

• 2500 meters

• 5500 meters

Tags

NGSS.HS-ESS1-5

What supports the 2500-meter elevation of the spreading ridge?

• Thick lithospheric mantle

• Asthenosphere

• Hot, lower-density mantle rock

• Cold ocean water

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-3

What happens to the lithospheric plate as it moves away from the ridge?

• It becomes thinner and hotter

• It melts

• It remains the same

• It thickens and cools

Tags

NGSS.HS-ESS1-5

At what temperature is the bottom of the oceanic plate?

• 1300° centigrade

• 1000° centigrade

• 600° centigrade

• 1500° centigrade

Tags

NGSS.HS-ESS2-3

What force pushes ocean plates away from spreading ridges?

• Asthenosphere flow

• Mantle convection

• Ridge push

• Slab pull

Tags

NGSS.HS-ESS1-5

What is the rate of subduction for a 30-million-year-old ocean plate?

• 2 centimeters per year

• 7 centimeters per year

• 5 centimeters per year

• 3 centimeters per year

Tags

NGSS.HS-ESS1-5

What is the temperature difference between the subducting plate and the asthenospheric mantle at 150 km depth?

• 500°

• 1200°

• 1000°

• 800°

Tags

NGSS.HS-ESS2-3

Where do great megathrust earthquakes occur?

• Within the asthenosphere

• On the shallow part of the boundary between converging plates

• In the middle of the oceanic plate

• At the spreading ridge

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

What is the primary energy source for plate tectonics?

• Ocean currents

• Wind energy

• Earth's internal heat

• Solar energy

Tags

NGSS.HS-ESS2-3