Download How Are Landforms Created and Changed Handout

Name: ______________________ Date: ____________________
HOW ARE LANDFORMS CREATED AND CHANGED?
Landforms are created by different _____________ forces. Some are within __________, and
some are on the __________ of Earth. Landforms can also be changed by ___________.
These changes can be disastrous for us.
EARTH’S MOVING PLATES
Plate tectonics - _______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
lithosphere - __________________________________________________________________
__________________________________________________________________
convection flow - ______________________________________________________________
______________________________________________________________
______________________________________________________________
asthenosphere - _______________________________________________________________
_______________________________________________________________
_______________________________________________________________
The plates __________ constantly. Their movement is ____________ by convection
flows underneath them. Convection flow is the circular motion that occurs when warmer material
rises and is replaced by cooler material. The plates ___________ on the asthenosphere, which
is a layer of semi-molten rock under the lithosphere. As it heats, it becomes less dense and
____________. It flows ______________.
It is replaced _____________ by the flow of cooler semi-molten materials. This material
heats up and then flows _____________. In turn, it is replaced. This creates a ______________
motion. The plates, which sit on top of the flows of material, are pushed along as if they are on a
conveyor belt. The major plates carry both the ______________ and the _____________ floors.
Where the plates of the lithosphere pull ______________ from each other, magma
erupts through the Earth’s surface as ____________, creating ______________ mountains.
Where the plates ____________ or rub together, they create ______________ and sometimes
____________________.
Copy figure 1.10 in the space below. Use pencil crayons to colour.
PLATES BUILD MOUNTAINS
1. Divergent Plate Boundaries
divergent boundary - ____________________________________________________
______________________________________________________________________
______________________________________________________________________
Magma moves ___________ between the plates, creating new rock. Volcanic ________
is common in these areas. The ___________________ is an example. There continues
to be volcanic activity along this __________________ ridge.
2. Transform Plate Boundaries
transform boundary - ____________________________________________________
______________________________________________________________________
______________________________________________________________________
This creates friction, which often creates ______________. The San Andreas
_________ near San Francisco, California, is a transform fault that is about ________
km long.
3. Convergent Plate Boundaries
convergent boundary - ____________________________________________________
______________________________________________________________________
______________________________________________________________________
When two continental plates meet, the constant ________________ against each other
causes the edges of the plates to _______________ and push up. They become
_________ mountains. When an ____________________ plate and a
_________________ plate collide, the
ocean plate is forced under the
continental plate, creating a
_____________. The pressure along
the trench creates ________________.
Magma from below bursts to the surface
through the _________________ layers
nearby, creating a ________________.