Plate Tectonics and Volcano Formation

The video explains the theory of plate tectonics, describing how Earth's continents rest on moving plates. It details the role of the asthenosphere in plate movement, the formation of oceanic ridges, and the process of subduction leading to volcanic activity. Over millions of years, these processes transform the Earth's surface.

What is the theory that explains the movement of the Earth's plates?

• Continental Drift

• Plate Tectonics

• Seafloor Spreading

• Volcanism

What lies beneath the lithosphere and is responsible for its movement?

• The Core

• The Crust

• The Oceanic Ridge

• The Asthenosphere

What happens when material in the asthenosphere rises and spreads out?

• It creates oceanic trenches

• It causes earthquakes

• It moves lithospheric plates apart

• It forms mountains

What is formed when the Earth's crust is lifted and an oceanic ridge is created?

• A volcanic island

• A new continent

• An oceanic ridge

• A mountain range

What is the process called when oceanic crust sinks beneath continental crust?

• Subduction

• Convection

• Erosion

• Sedimentation

What can form when magma from subduction zones reaches the Earth's surface?

• Earthquakes

• Volcanoes

• Tsunamis

• Mountains

Where do most of the world's volcanoes form?

• Along oceanic ridges

• At the poles

• In the middle of continents

• Along subduction zones

How much do the Earth's plates move each year?

• A few meters

• A few kilometers

• A few centimeters

• A few millimeters