A Destructive Plate Margin and Constructive Plate Margin


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A Destructive Plate Margin and Constructive Plate Margin

These are the plates and were they meet

Were the arrows are pushing against each other this is called a
DESTRUCTIVE PLATE MARGIN here a oceanic plate and a lighter
continental plate push against each other the oceanic being heavier is
pushed down into the mantle and melted down then the magma finds a
crack or hole and pushes the magma above the ground to form a volcano.
Where the plates are pulling away from each other this is called a
CONSTRUCTIVE PLATE MARGIN here an oceanic and a continental plate pull
apart from each other. Magma rises to fill the gap and if it reaches
the surface it erupts as a volcano. Over time the ridge is built up by
volcanic successive eruptions and volcanic islands may appear above
the surface of the ocean e.g. surtsey.

[image - cross section of the earth]

Plate Boundary

Diagram

Description

Example

Constructive plate boundaries

[IMAGE]

Constructive plate boundaries occur when two plates move away from
each other

North American and Eurasian Plate

Destructive plate boundaries

[IMAGE]

Destructive plate boundaries occur when an oceanic plate is forced
under a continental plate

Pacific Plate and the Eurasian Plate

Conservative plate boundaries

[IMAGE]

Conservative plate boundaries occur when two plates slide past each
other.

North American Plate and the Pacific Plate

Collision plate boundaries

[IMAGE]

Collision plate boundaries occur when two continental plates move
towards each other.

Indo-Australian and the Eurasian Plate

When you get plates moving apart from each other i.e. the South
American plate and the African plate. These causes a gap were magma
rises and we get a volcano. This starts in the sea but after constant
eruptions the lava builds up and solidifies. This then builds up until
the volcano gets higher and higher.

When an oceanic plate pushes against a continental plate this causes

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the oceanic plate to be pushed down and be melted in the mantle then
the magma made from the melting of the oceanic plate is pushed up
through a gap to make a volcano.

SOME FACTS!

1. Measuring 30 to 75 km thick the continental crust is thicker than
the oceanic crust, which is only 3 to 10 km thick.

2. The most ancient rocks, dated to more than 4 billion years, are
found in the central regions of the continents.

3. In the Pacific plate, the most ancient parts are only about 200
million years old. This crust is formed when two oceanic plates move
apart from each other, causing magma to ooze up from the mantle. This
magma solidifies to form volcanic rock.

4. The continental plate is lighter then the oceanic plate.


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