Earthquakes and volcanoes 3.2: Moving Plates

• Aardrijkskunde
• Middelbare school
• havo
• Leerjaar 3

3.2 Moving plates

Goals

After studying this section, you will be able to:

* Describe in which direction the tectonic plates move

* Explain why earth’s tectonic plates move

Do you remember?

What is the difference between oceanic crust and continental crust?

Flow of magma within the mantle

The flow within the mantle causes plate tectonics

Mantle

Divergent plate movement

Divergent movement of oceanic crust --> mid-ocean ridge

Divergent plate movement

Divergent movement of continental crust 

--> Rifts and fault blocks

What could be happening with the crust prior to figure A? How does it look like?

Before figure A the crust looked like this:

What is the effect of two continental plates moving divergently?

1. Horst and graben
2. Mid-oceanic ridge

What is the effect of two continents colliding?

1. Fold mountains
2. Volcanoes
3. Subduction
4. Trench

Divergent

Convergent

Earthquakes

Subduction

Volcano

Transform

Fold mountains

Earthquakes

Fold mountains

Volcanoes

Earthquakes

Trench

Subduction

Island arcs

Volcanoes

Earthquakes

Trench

Subduction

Volcanoes

Earthquakes

Horst and graben

Fould blocks

Mid oceanic ridge

Volcanoes

Earthquakes

Earthquakes

Earthquakes

Earthquakes

Oceanic

Oceanic

Oceanic

Plate tectonics and its effects