Seafloor Spreading Theory

Front

What technology was used during World War II to create maps of the ocean floor?

Back

SONAR

Front

Who was Marie Tharp?

Back

An American oceanic cartographer who made key discoveries using SONAR maps.

Front

What significant underwater feature was discovered?

Back

An underwater mountain range.

Front

What is located at the center of the underwater mountain range?

Back

A rift valley.

Front

What was found about the age of the seafloor compared to continental crust?

Back

The seafloor is geologically young compared to continental crust.

Front

Who proposed the Seafloor Spreading Theory and in what year?

Back

Harry Hess proposed the theory in 1960.

Front

What happens at mid-ocean ridges according to the Seafloor Spreading Theory?

Back

New oceanic crust forms as magma rises and solidifies.

Front

What happens to the older crust as new crust is formed?

Back

The older crust moves away from the ridge.

Front

What does the center slit of the model represent?

Back

A Mid-Ocean Ridge.

Front

What do the strips of paper in the model represent?

Back

The oceanic crust (seafloor).