Plate Tectonics (continental drift and seafloor spreading)

What is TRUE of tectonic plates?

There are 9 large tectonic plates.

The deepest part of the ocean is called a valley.

Molten rock that comes out onto the surface of the Earth is called lava.

What is NOT one of the 3 layers of the Earth?

Approximately how many small tectonic plates are there?

Harry Hess came up with the theory of seafloor spreading.

The magnetic field of a mineral is locked in time the moment it forms.

The place where magma reaches the surface of the Earth in the middle of a tectonic plate is called a hot spot.

The boundary where two tectonic plates slide past one another.

The boundary where two plates pull apart from one another.

What does the Greek term Pangaea mean?

The place where old oceanic crust is forced back down into the Earth.

What landform typically develops over a hot spot?

Which boundary will you probably NOT find volcanoes nearby?

The boundary where two tectonic plates come together.

When two oceanic plates diverge from one another, what landform results from it?

A magma chamber is an underground pocket of molten rock.

What is NOT evidence of seafloor spreading.

The crack found down the middle of a mid-ocean ridge?

Which is TRUE of the Earth's landmasses?

Name the single giant landmass in Alfred Wegener's theory.

The most obvious evidence of continental drift is the continents appear to fit together like puzzle pieces.

The Theory of Plate Tectonics combined which two theories?

When two tectonic plates of equal density come together, what landform typically results from it?

Name the theory that states the Earth's crust is broken into plates that float on liquid mantle.

Name given to molten rock underneath the Earth's surface.

The CLOSER oceanic crust is to a rift the YOUNGER it is.

Convection currents are caused by heat from the core.

Which is NOT evidence of continental drift?

The mantle is located between the crust and the core.

Name the terms geologists use to differentiate the two kinds of crust found on Earth.

What causes tectonic plates to move?

When an ocean plate comes together with a continent plate, what landform typically results from it?

Continental crust is YOUNGER than oceanic crust.

Alfred Wegener enjoyed much praise and fame during his lifetime.

What is the name for ANY mountain range found on an ocean's floor?

The dividing line between one tectonic plate and another.

The name for the process that forms new seafloor.

If magma can't get out onto the Earth's crust, it cools down and heads back toward the core.