Download Reasons and types of plate movement

Reasons and types of
plate movement:
Reasons and types of
plate movement:
Why and how do
plates move?
Density:

Density: The amount of matter of a
substance in a given space or volume.
Density:


Density: The amount of matter of a
substance in a given space or volume.
Density = mass / volume
Density:



Density: The amount of matter of a
substance in a given space or volume.
Density = mass / volume
D=m/v
Density:



Density: The amount of matter of a
substance in a given space or volume.
Density = mass / volume
D=m/v

The more dense a material is the more it
will “sink”.
Density:



Density: The amount of matter of a
substance in a given space or volume.
Density = mass / volume
D=m/v


The more dense a material is the more it
will “sink”.
The less dense a material is the more it will
“rise”.
Density:

D=m/v

Heating a material causes the molecules to
move apart which increases its volume.
Density:

D=m/v

Heating a material causes the molecules to
move apart which increases its volume.

When volume goes up …. Density goes down
Density:

D=m/v

Heating a material causes the molecules to
move apart which increases its volume.


When volume goes up …. Density goes down
What is the density of an object with a mass of
10 grams and a volume of 2 ml?
Density:

D=m/v

Heating a material causes the molecules to
move apart which increases its volume.



When volume goes up …. Density goes down
What is the density of an object with a mass of
10 grams and a volume of 2 ml?
What is the density of the same object that still
has a mass of 10 grams but a volume of 5 ml?
How do the plates move?:

Convection currents of hot magma in
the upper mantle that is part of the
lithosphere cause the plates to move as
the plates ride around on top of it.
Convection Current:
Cool !!!
Molecules:
Heating
Up
Cooling
Off
The circular flow is due to the
heating and cooling of
molecules which changes their
density.
HOT !!!
Convection Current:
3. Molecules cool and become more
dense.
4. So they
sink.
2. So they
rise.
1. Molecules heat and become less
dense.
Plate Movement Direction:
So what can happen?
So what can happen?

Three types of boundaries can form
from this movement.
So what can happen?

Three types of boundaries can form
from this movement.

Convergent: two or more plates moving
toward each other
So what can happen?

Three types of boundaries can form
from this movement.


Convergent: two or more plates moving
toward each other
Divergent: two or more plates moving
away from each other
So what can happen?

Three types of boundaries can form
from this movement.



Convergent: two or more plates moving
toward each other
Divergent: two or more plates moving
away from each other
Transform: two plates that are next to each
other move parallel to each other in
opposite directions.
Convergent Boundaries
Direction
Direction
Plate
Plate
Convergent Boundaries:

Types:

Oceanic-Oceanic: One plate gets
subducted (pushed under) the other and a
trench is formed as well as undersea
volcanoes.
Called a subduction
zone.

Convergent Boundaries:

Types:

Oceanic-Continental: The ocean plate is
subducted under the continental plate.
Called a subduction zone.
 Strong earthquakes
happen here.

Convergent Boundaries:

Types:

Continental-Continental: Neither plate is
pushed under. Instead they both buckle
and push upward.

This is what creates mountain ranges.
Divergent Boundaries:
Direction
Direction
Plate
Plate
Divergent Boundaries
Transform Boundaries:
Direction
Plate
Plate
Direction
View from above
when looking
down on the
plates.
Convection currents are
still happening
underneath.