"Volcano" PPT courseware

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"Volcano" PPT courseware

Part One: Questions and Thoughts:

1 What color is the material ejected by the volcano? What's its temperature? Do you know its name?

Magma is a molten material composed of rock, gas and water from the Earth's mantle. Magma that reaches the surface is called lava.

2 What else did you see above the crater?

The causes of volcanoes

Volcanic eruptions are a strong display of the energy released by magma. That is, when the magma energy inside the earth accumulates to a certain extent, it will erupt to the surface along weak areas of the earth's crust under strong pressure, forming a volcanic eruption phenomenon.

Part 2: Collection of information and group discussion

1. What are the dangers of volcanic eruptions?

2. Are volcanic eruptions good for humans?

Volcanic hazards

1. Pollute the air

2. Burn down the forest

3. Destroy farmland

4. Covering cities and villages.

Volcano classification

According to the degree of activity, it can be divided into:

1: Extinct volcano.

2: Active volcano.

3: Dormant volcano.

Part 3: After-class exercises

1. Let me fill it out:

1. Magma deep in the earth's crust rises along cracks in huge _____. Some of the rising magma will cool down as it rises, forming _____, and some may rush out of the ground to form _____.

2. A volcano is a cone-shaped mountain formed by the cooling of __________ that falls during a volcanic eruption and the _____ that gushes out of the ground.

3. Some volcanoes never erupt again after an eruption. Such volcanoes are called _____. Some volcanoes will erupt after a period of time. Such volcanoes are called _____. In addition, there is another type of volcano called _____.

4. Volcanic eruptions bring us disasters but also bring us benefits. For example, when magma moves upward and erupts, mineral deposits such as __________ are formed underground.

2. Be a good little judge:

1. There are more than 600 volcanoes discovered in my country, all of which are extinct volcanoes. ( )

2. The Earth is the only body in the solar system with volcanic activity. ( )

3. Volcanic eruptions are caused by movement of the earth's crust. ( )

4. The deeper you go into the earth's crust, the greater the pressure and the higher the temperature. ( )

5. Volcanic eruptions are a natural phenomenon that are harmful to humans but not beneficial at all. ( )

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Update Time: 2024-09-12

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 2 industry PPT template

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