Year 9 Geography Plate Boundries

What happens on a destructive margin?

One plate subducts under another

What types of plate do you find on a destructive margin?

One of each

In which direction do the plates move on a destructive margin?

Towards each other

Do you get volcanoes, earthquakes or both on a destructive margin?

Both

What type of volcanoes are formed on a destructive margin?

Composite

What are eruptions like on a destructive margin?

Not very often and violent

In which direction do the plates move on a constructive margin?

Away from each other

What types of plate do you find on a constructive margin?

Two of the same

Do you get volcanoes, earthquakes or both on a constructive margin?

Both

What type of volcanoes are formed on a constructive margin?

Shield

What are eruptions like on a constructive margin?

Frequent but mild

What happens on a constructive margin?

Lava cools to form volcanic rock

In which direction do the plates move on a conservative margin?

Past each other at differing speeds

What types of plate do you find on a conservative margin?

Any

Do you get volcanoes, earthquakes or both on a conservative margin?

Earthquakes

What happens on a collision margin?

Plates are pushed up to form fold mountains

In which direction do the plates move on a collision margin?

Towards each other

What types of plate do you find on a collision margin?

2 continental

Do you get volcanoes, earthquakes or both on a collision margin?

Earthquakes

Example of a destructive margin?

Nazca and South-American

Example of a constructive margin?

Mid-Atlantic Ridge

Example of a conservative margin?

San Andreas Fault

Example of a collision margin?

The Himalayas

What are convection currents?

Currents of heat within the mantle

Where does ridge push happen?

Constructive margins

Where does slab pull happen?

Destructive margins

How thick is the crust?

5 - 70km

How thick is the mantle?

2900km

How thick is the outer core?

2200km

How thick is the inner core?

1200km

What's the temperature of the crust?

400 degrees

What's the temperature of the mantle?

4000 degrees

What's the temperature of the outer core?

5500 degrees

What's the temperature of the inner core?

Above 5500 degrees

What material is the crust made of?

Solid rock

What material is the mantle made of?

Semi-solid rock

What material is the outer core made of?

Liquid iron and nickel

What material is the inner core made of?

Solid iron and nickel

Where are there most volcanoes and earthquakes?

Pacific Ring of Fire