Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

The theory that explains why and how continents move is called

Continental drift

By what time period was there evidence supporting continental drift, which led to the development of plate tectonics?

Mesozoic Era

What is "plastic" rock, and how does it move?

Asthenosphere it flows very slowly

Describe how continents and oceans are carried on tectonic plates.

They are on top of the plates and they move

How many major tectonic plates have scientists identified?


Why are the boundaries of the tectonic plates not always easy to identify?

Familiar outlines of the continents and oceans often do not match the outlines

How do scientists identify plate boundaries?

By studying data from earthquakes

A sudden movement along the boundary of a tectonic plate is a (n)


Frequent earthquakes in a given zone are evidence that

2 or more plates may meet in the area.

How do volcanoes help to identify the locations of plates boundaries?

Some form when plate motions generate magma that erupts on Earths surface

A zone of active volcanoes that encircles the Pacific Ocean is known as the

Pacific Ring of Fire

What do the characteristics of the Pacific Ring of Fire indicate?

That the pacific oceans is surrounding by plate boundaries

Name three areas where plate boundaries may be located

Middle of ocean basin edges of the continents within countries

What happens to magma at divergent boundaries?

it rises to the surface and cools to form new ocean lithosphere.

Describe the rock that forms when magma cools to form new oceanic lithosphere

Warm, light and sits higher than the surroundings sea floor because it is less dense

A narrow valley that forms where the plates separate at a divergent boundary is called a

Mid-ocean ridge

Where are most divergent boundaries located?

Ocean floor

Describe an example of a rift valley

The Red Sea

When oceanic lithosphere collides with continental lithosphere, the oceanic lithosphere is less dense than the continental lithosphere, so it sinks or


What deep-ocean feature forms at subduction zones?

Deep-ocean trenches

As the oceanic plate subducts, it heats up and releases fluids into the mantle, causing magma to form and rise to the surface, forming

Oceanic lithosphere

What happens when two plates made of continental lithosphere collide?

what happens is oceanic lithosphere is denser. it subducts, or sinks under the less dense continental lithosphere

What is an example of a large mountain range formed when two plates made of continental lithosphere collided?

Himalayas Mt

What happens when two plates made of oceanic lithosphere collide

one plate subducts under the other plate and makes a deep ocean trench. Fluids are released from the subducted plate causes mantle rock to melt and form magma.

What is produced from magma formed from melted rock?

Island arc

An example of a feature that formed when two plates made of oceanic lithosphere collided is

Volcanic Mountains

What causes earthquakes at transform boundaries?

Boundary at which two plates slide past each other horizontally

How are transform boundaries different from other types of boundaries?

They don't produce magma

An example of transform boundary is the

San Andreas

The San Andreas Fault is located between which two plates?

Between North America and the Pacific Plate

Transform boundaries that connect short segments of a mid-ocan ridge are called

Fracture zones

What is an example of a convergent boundary?

South American and Nazca plates at the chilean trench along the west coast of South America

What is an example of a divergent boundary in the mid-Atlantic?

North America and Eurasian plates at the mid-Atlantic Ridge.

The movement of heated material due to differences in density is called


The cycle in which the cooler, denser water sinks and the warmer water rises to the surface to create a cycle is called

A convection cell

Earth's mantle is heated by energy generated by

Earth's core and radioactivity

What causes tectonic plate movement?

Hot material in the mantle sinks

What happens to newer, warmer rock at a mid-ocean ridge as it cools?

It is elevated above nearby rock

The force on the rest of the plate from the asthenosphere below cooling, sliding rock is called

Ridge Push

What happens as a result of ridge push

Ridge push may help and drive plate motions. most scientist agree that ridge push is not the main driving force of plate motion.

Is Ridge push the main driving force of plate motion? along with ridge push, what did scientists study for clues about forces that drive plate motion?

No it is not the main driving force. scientists looked to convergent boundaries for other clues about forces that drive plate motion,

What happens to magma is places where plates pull away from each other at mid-ocean ridges?

Magma forms the asthenosphere rises to the surface.

The force exerted by a sinking plate caused by the subduction of lithosphere into the asthenosphere is called

Slab pull

Compared to the speed of plates that are not suducting plates that are subducting move


What three mechanisms of Earth's convecting system work together to cause plate motions?

The three mechanism are convection cell, ridge push and slab pull work together to cause plate motions.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording