Chapter 7: Plate Tectonics

Scientists believe that differences in ______ cause hot rock in the asthenosphere to rise toward Earth's surface.

Crust is neither destroyed nor formed along which of the following boundaries?

Features found at divergent plate boundaries include ______.

While studying the ocean floor, scientists found ______ bands of magnetism.

Many early mapmakers thought Earth's continents had moved based on ______.

The presence of the same _____ on several continents supports the hypothesis of continental drift.

As new seafloor moves away from an ocean ridge, the seafloor cools and becomes LESS DENSE than the material beneath it.

Some early mapmakers thought that the coastline of South America matched the coastline of ASIA.

The weight of the subducting plate helps to pull the lithosphere into a subduction zone in a process called RIDGE PUSH.

Seafloor spreading occurs because _______.

Continental drift was not widely accepted when it was first proposed because __________

Plates move apart at _______ boundaries.

____ is a fossil fern that helped support Wegener's hypothesis of continental drift.

The alignment of iron minerals in rocks when they are formed reflects the fact that Earth's ______ has reversed.

Scientists rejected the hypothesis of continental drift because it could not explain HOW OR WHY EARTH'S CONTINENTS MOVE.

If two CONTINENTAL plates converge, a subduction zone forms.

A ______ can also form when two oceanic plates collide.

The _______ is (are) an example of a transform fault boundary.

The crust and the upper mantle make up Earth's _______.

The downward part of a convection current causes a sinking force that _______.

The circulation of material caused by differences in density is called CONVECTION.

The existence of coal beds in Antarctica indicates that the continent once had ______.

Matching ______ on different continents are evidence for continental drift.

_______ are formed when two continental plates collide.

Plates interact at plate boundaries by DEFLECTING FROM EACH OTHER, moving apart, or moving horizontally past each other.

The boundary between two plates moving together is called a _____.