Plate Tectonics

The thickness of the ocean floor ___ with distance from an ocean ridge

A German meteorologist who presented his hypothesis on continental movement

An imaginary line on a map that shows points that have the same age

When the weight of the uplifted ridge is though to push the ocean plate towards the trench

A process that happens when the flow in the outer core of the Earth changes, and Earth's magnetic field changes

At an oceanic-oceanic convergent boundary, what is located parallel to the trench formed?

What chapter is this test over?

The hypothesis that Earth's continents were joined as a single landmass, that broke apart and slowly moved

The theory that explains how new oceanic crust is formed at ridges and destroyed at trenches?

Short-term changes in the Earth's magnetic field are called

A region where two tectonic plates are moving towards each other.

___ is the transfer of thermal energy by the movement of heated material from one place to another

___ ocean floor crust is near ocean ridges

A process where the dense subducting plate pulls the trailing slab into the subduction zone

At a oceanic-continental convergent boundary, which plate will subduct?

Regions with normal and reverse polarity form stripes on the ocean floor that run ___ to ocean ridges

As the magma in the mantle is heated it ____

Earth's present magnetic field is called ___ polarity

A ___ happens when the flow in the outer core changes and Earth's magnetic field changes directions

What technology do scientists use to measure water depth and the topography of the ocean floor?

In what decade did scientists finally begin to accept Wegner's hypothesis of continental drift?

Continental-continental convergent boundaries create what topographical feature?

How is a magnetometer used to detect changes in magnetic field of ocean floor?

Huge pieces of the crust and ridged upper mantle that fit together at their edges to cover the Earth's surface

What is the main factor that determines which plate will subduct (go under the other)?

The study of the history of Earth's magnetic field

Long-term changes in the Earth's magnetic field are called

Why was Alfred Wegner's theory rejected?

_____ ocean crust is found along deep-sea trenches

The magnetic field that is opposite to the present magnetic field has ___ polarity

A region where two tectonic plates are moving apart.

Along with ocean ridges, scientists discovered ___ which are narrow, underwater depressions in the seafloor

When continental crust begins to separate at a divergent boundary, it forms...

A device that detects small changes in magnetic field

A region where two plates slide horizontally past each other

How did Wegner use fossils of plants & animals found on different continents?

The process of subduction creates an ocean ____.

What are responsible for transferring thermal energy from Earth's interior to its exterior?

WHY did scientists finally accept Alfred Wegner's hypothesis of continental drift?

A process when two plates collide and the denser plate descends below the other

Abraham Ortelius thought what kind of activities caused the continents to move

Wegner was able to match rock layers from Greenland and Europe to _____ to use as evidence for continental drift

A Dutch cartographer who noticed the apparent fit of the contients

Wegner discovered coal on Antarctica, what does that mean?

Transform boundaries are characterized by what two features?

What part of the Earth is responsible for moving tectonic plates?

The surface of the Earth has...

When did Pangea begin to break apart?

As the magma in the mantle cools it ____

What is the deepest ocean trench we have discovered?

A long, narrow depression that is formed from stretched crust

What formations run along the ocean floor around the Earth, much like seams on a baseball?

What is the ancient super continent made up of all the continents that began to break apart 200 mya