Les 5 - Intro 1.3 vulkanen

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 3

Planning

• Homework check
• Start §1.3 Volcanoes
• Types of volcanoes
• Why do people live near volcanoes

Homework check

Key words §1.3

Magma - Liquid rock in the earths mantle

Lava - Liquid rock from the earths mantle that comes out of the crater of a volcano

Crater - The place where magma flows out a volcano and turns into lava

Volcano - Place where liquid magma flows out from the earths mantle

Mid-ocean ridge - A place in the middle of an ocean where plates move apart and magma comes flowing out.

Learning objectives

1. You know what a volcano is and what the consequences of volcanic eruptions can be
2. You understand how, and where volcanoes are formed 
3. You understand why the consequences for people in poor countries differ from the consequences for people in rich countries.

Mid-ocean ridge

This type of volcano froms when two oceanic plates move away from each other. This is what we call divergent plate movement. These volcanoes are usually quite calm, because the lava flowing out is not blocked by anything.

Magma

The liquid rock in the mantle is called magma

Subduction

Subduction happens when an oceanic plate dives below another plate. The plate that dives into the mantle melts and causes magma to start flowing up. This is what causes vulcanism.

Lava

As soon as the magma is outside the volcano it is called lava. 

Volcano

This is a volcano. A coneshaped mountain that can erupt and can have lava flowing out. When a volcano is formed by subduction the eruptions can be explosive, because the crater can get blocked by lava solidifying (stollen) in the crater.

Crater

The place where the magma leaves the volcano is called the crater

What is the difference between lava and magma?

Mid-ocean ridges have explosive volcanos

1. True
2. False

Experiment

• This will show why mid-ocean ridges are not explosive and normal volcanoes are.
• Using balloons

Statement: 29 million people worldwide live near volcanoes

1. True
2. False

www.nationalgeographic.nl

Why do people still want to live near a volcano? (Everyone with three correct, or more, get a checkmark)

Reasons to live near a volcano

1. A good place for generating geo-thermal energy

Reasons to live near a volcano

1. A good place for generating geo-thermal energy
2. The ground is fertile

Reasons to live near a volcano

1. A good place for generating geo-thermal energy
2. The ground is fertile
3. It is good for tourism

Reasons to live near a volcano

1. A good place for generating geo-thermal energy
2. The ground is fertile
3. It is good for tourism
4. Cultural reasons
5. lack of money for moving

Are these reasons more important for people living in poor countries or people in rich countries?

1. Rich countries
2. Poor countries
3. Both
4. Neither

Homework

Assignment 1, 2, 3 and 6 of §1.3