Seafloor Spreading and Plate Tectonics Theory

The SONAR is used for mapping ocean floors, for measuring ocean depths, and for detecting submarines and mines.

• TRUE

• FALSE

There are ______ major tectonic plates on Earth.

Harry Hammond Hess published the Seafloor Spreading Theory based on Holmes mantle convection current.

• TRUE

• FALSE

__________ proposed that Earth’s crust was like a puzzle divided into several large plates that fitted together.

• Alfred Wegener

• John Wilson

• Arthur Holmes

This theory states that Earth’s outermost layer is divided into dozens of large and small plates that are moving relatively.

• Seafloor Spreading

• Continental Drift Theory

• Plate Tectonic Theory

He introduced mantle convection, a mechanism that could drive the movements the continents.

• Arthur Holmes

• Harry Hammond Hess

• John Wilson

The motion of the rock is called ________

• expansion

• convection

• condensation

• exploitation