Plate Tectonics

Which is a source of indirect evidence for the structure of the Earth?

Wegener thought that the coastlines of Africa and _______ seemed to match up.

A compass needle in the northern hemisphere will point to....

Continental crust is composed mostly of ______.

Select the densest type of Earth's Crust.

What has happened to the Earth's magnetic field over millions of years?

The Earth is composed of layers. What is the outermost layer of Earth called?

Alfred Wegener called the supercontinent.....

About ______ years ago, the continents were joined together in one supercontinent.

In the mid-1900's scientists mapped the ocean floor using......

In general, what happens to temperature and pressure with increased depth within the Earth?

A chain of mountains that runs along the middle of the ocean floor.

Most geologists originally ______ Wegeners idea of continental drift.

the most outer layer of the Earth.

Which type of wave is used to determine the structure of Earth?

Heat from the ______ creates convection currents in the ______.

The Earth is composed of layers. What layer creates the magnetic field of the Earth?

In a process taking tens of millions of years, part of the ocean floor sinks back into the __-.

Which layer of the Earth creates convection currents causing the crust to move?

Why is the hot inner core solid and not a liquid?

A large landmass is called .....

The San Andreas Fault is an example of which type of plate boundary?

The Earth is composed of layers. Which layer is solid and composed of mostly iron and nickel?

In 1910, this scientist theorized that the continents had moved.

_________ currents in the Earth's mantle cause plates to move along _____ .

Which of the following is not evidence of sea-floor spreading?

Near which letter would you find magnetic stripes?

The longest mountain ranges in the world are found in ......

The theory of _____ ______ states that the Earth's plates are in slow constant motion.

Earth's plates move apart at ______ boundaries.

Changes in the Earth's magnetic field creates magnetic ____ on the ocean floor.

Which letter would represent a deep ocean trench?

This process adds more crust to the ocean floor.

The process of _____ allows ocean floor to sink back into the mantle.

The theory that the continents are moving is called.....

Earth's plates move together at _____ boundaries.

What type of plate boundary exists in the Mid-Atlantic Ridge?

Earth's plates slip past each other at ______ boundaries.

The deepest part of the ocean is along the ______ trench in the _____ ocean.

Where pieces of Earth's crust diverge on land, a deep valley called a _____ valley forms.