Plate Tectonics Review

Front

The youngest material of the ocean floor is found at mid-ocean _________.

Back

ridges

Front

The presence of the same ________ on several continents supports the idea of continental drift.

Back

both fossils and rocks

Front

A lack of evidence for continental drift prevented many scientists from believing a single supercontinent called _________ existed.

Back

Pangaea

Front

The theory of _______ states that Earth’s crust and upper mantle are broken into sections that are in constant, slow motion.

Back

plate tectonics

Front

Matching ________ on different continents are evidence for continental drift.

Back

rock structures

Front

Many scientists think hot plastic-like rock in the mantle is forced upward toward the surface, cools, and sinks. This process is called a(n) _________.

Back

convection current

Front

The _________ is the thinnest layer of Earth.

Back

crust

Front

_______ are formed when two continental plates collide.

Back

Mountain ranges

Front

The theory of continental drift was first proposed by __________.

Back

Alfred Wegener

Front

The theory of seafloor spreading was first proposed by __________.

Back

Harry Hess