tectonic plates

Front

What type of crust is found under the world's oceans?

Back

OCEANIC

Front

What type of boundary occurs when tectonic plates move apart?

Back

Divergent plate boundary

Front

Why does subduction occur?

Back

Old crust is more dense and gravity helps pull the crust back into the mantle.

Front

Which type of crust is denser and heavier?

Back

OCEANIC

Front

Why did scientists initially reject Alfred Wegener's hypothesis of continental drift?

Back

Wegener could not explain the force that could move the continents.

Front

What is the theory of plate tectonics?

Back

The theory that the Earth's outer shell is divided into several plates that glide over the mantle.

Front

What is a convergent plate boundary?

Back

A boundary where two tectonic plates collide, often forming mountains or causing subduction.

Front

What is a transform plate boundary?

Back

A boundary where two tectonic plates slide past each other horizontally.

Front

What geological features are commonly formed at divergent boundaries?

Back

Mid-ocean ridges and rift valleys.

Front

What is subduction?

Back

The process where one tectonic plate moves under another and sinks into the mantle.