Changing Earth Unit

Front

Who proposed the theory of continental drift?

Back

Alfred Wegener

Front

What part of Earth's crust makes up the landmasses and is less dense?

Back

Continental crust

Front

What is the rock cycle?

Back

A series of processes on the surface and inside Earth that slowly changes rocks from one kind to another.

Front

What process in the upper mantle helps move the lithospheric plates?

Back

Convection

Front

Which layer of Earth is best described as a molten state of medium density made of mostly silicon and oxygen?

Back

Mantle

Front

What is the outer core primarily made of?

Back

Liquid iron and nickel.

Front

What is subduction?

Back

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

Front

What is seafloor spreading?

Back

The process by which new oceanic crust is formed at mid-ocean ridges and older crust is pushed away.

Front

What are tectonic plates?

Back

Large pieces of Earth's lithosphere that move and interact with each other.

Front

What is the difference between oceanic crust and continental crust?

Back

Oceanic crust is denser and thinner, while continental crust is less dense and thicker.