1.3 Volcanoes

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Slide 1: Video
AardrijkskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 21 slides, with interactive quiz, text slides and 1 video.

time-iconLesson duration is: 60 min

Items in this lesson

Slide 1 - Video

1.3 Volcanism
Page 12 and 13 of the textbook.

Recap earthquakes
Check homework
Instruction
Let's practice

Slide 2 - Slide

One piece of Earth's crust please

Slide 3 - Slide

Plate tectonics
Convergent
Convergent
Divergent
Transform

Slide 4 - Slide

How are earthquakes connected to plate tectonics?

Slide 5 - Slide

Epicentre
The earthquake is most powerful right above the place where the ocean floor was jammed. That is called the epicentre.

The Richter Scale indicates the strength of the earthquake. The scale goes from 1 (weak)
tot 12 (strong).

An earthquake with a scale of 6 is 10 times stronger than a quake of 5, and 100 times stronger than a quake of 4.



Slide 6 - Slide

Did you manage to do the homework?
Page 10 of the workbook (or 1.2 online): 1, 3 and 7.

Slide 7 - Slide

What do you know about volcanoes?

Slide 8 - Slide

Why do volcanos occur in places where there are also earthquakes?

Slide 9 - Slide

How does a volcano form?
Read 'How does a volcano form?' on page 12 of the textbook.

Write down in your own words how a volcano forms.

Finished early? Read 'Consequences of a volcano eruption'.

Slide 10 - Slide

How does a volcano form?

Slide 11 - Slide

Slide 12 - Slide

How does a volcano form?
A volcano is formed by a series of eruptions of lava and ash.
  •  rock ocean floor is pushed into mantel
  •  rock melts, magma is formed
  •  heated substance lighter than  surroundings
  •  heated substance wants to rise
  •  pressure too high: eruption
  •  magma becomes lava and leaves volcano via the crater

Slide 13 - Slide

Volcanoes in the ocean
Volcanos in the ocean:
  •  two parts of ocean floor move apart
  •  crack in the Earth’s crust
  •  filled with hot rock (lava)
  •  lava comes into contact with water
  •  lava solidifies
  •  a new piece of ocean floor is formed
  •  mid-oceanic ridge = sort of stretched out mountain range along the ocean floor

Slide 14 - Slide

Consequences of a volcanic eruption
What signs are there that a volcano is about to erupt?
  • small earthquakes
  • smoke
  • swelling
  • restless animals

Slide 15 - Slide

Consequences of a volcanic eruption
What are the possible consequences of a volcanic eruption?
  • Large areas become covered with ash and lava
  • Extremely hot gas clouds are formed which blast from the volcano

Slide 16 - Slide

Slide 17 - Slide

Consequences of a volcanic eruption
Why are the consequences of a volcano different for people in rich countries than in poor countries?
  • In rich countries people can signal that an eruption is going to take place more quickly and easily.
  • In rich countries the population can be warned and evacuated more quickly than in poor countries.

    Slide 18 - Slide

    Let's practice!
    Page 12 of the workbook (or 1.3 online): 3, 4 and 6.


    Slide 19 - Slide

    How do you call the movement of the tough rock within the Earth's mantle?
    A
    Currents
    B
    Magma currents
    C
    Plate tectonics
    D
    Convection currents

    Slide 20 - Quiz

    Next week
    Homework:
    Paragraph 1.3: 3, 4 and 6

    Next week: Camp week

    Slide 21 - Slide