5 - Volcanoes

• Aardrijkskunde
• Middelbare school
• havo
• Leerjaar 1

Natural Disasters

Bilingual educiation year 1

Mister de Graaf

Boss of Geography

This lesson

Test reflection

Volcanoes

Excercise

Natural Disasters Assignment

Test reflection

At which plate boundaries do volcanoes occur?

Volcanoes

Created by series of eruptions of lava and ash.

--> Ocean floor gets pushed into the mantle

--> Rock melts, magma is formed

--> Heated material is lighter than environment

--> Heated material wants to go up

--> Pressure gets too high: eruption

--> Magma becomes lava and leaves the crater

Mid-oceanic ridge

Divergent movement --> crack in the

Earth's crust

Filled up with lava

Lava solidifies through contact with

ocean water

New oceanic crust has formed

Mid-oceanic ridge

Elongated mountain on the ocean floor

Consequences eruptions

Why do the consequences of a volcanic eruption for people in poor countries differ from those in rich countries?

Two types of volcanoes

   Caldera

A volcanic crater that has a diameter

many times that of the vent and is formed

by collapse of the central part of a volcano

or by explosions of extraordinary violence.

1. Shield volcano
2. Stratovolcano
3. Caldera

1. Shield volcano
2. Stratovolcano
3. Caldera

1. Shield volcano
2. Stratovolcano
3. Caldera

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Volcanic excercises

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