7.1.2.2 Development of a Theory

Front

What is an isochron?

Back

An imaginary line on a map showing points of equal age.

Front

What is the theory that states Earth's surface is made of rigid plates that move with respect to each other?

Back

Plate tectonics.

Front

What type of rock forms when lava cools and crystallizes on the seafloor?

Back

Basalt.

Front

What is the largest tectonic plate on Earth?

Back

Pacific Plate.

Front

What is the deepest landform on Earth?

Back

Mariana Trench.

Front

What is the process by which tectonic plates move apart?

Back

Seafloor spreading.

Front

What is the term for the boundary where two tectonic plates meet?

Back

Plate boundary.

Front

What type of plate boundary is characterized by plates sliding past each other?

Back

Transform boundary.

Front

What is the name of the supercontinent that existed millions of years ago?

Back

Pangaea.

Front

What geological feature is formed at convergent plate boundaries?

Back

Mountain ranges or deep ocean trenches.