"Volcano" The Unquiet Earth PPT Courseware

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"Volcano" The Unquiet Earth PPT Courseware

1. Volcano

Volcanic activity is a spectacular and terrifying natural phenomenon. It has a dual impact on humans. It is both a geological disaster and a source of certain mineral resources.

1) Volcanoes can be divided into:

Active volcano - A volcano that is still in periodic activity.

Dormant volcano - has been active since recorded history, but has been inactive for a long time.

Extinct volcano - There were eruptions in prehistoric times, but they are no longer active in historical times.

Volcanic activity can occur on continents or on the ocean floor. As the earth's crust evolves, the earth's crust continues to thicken and volcanic activity gradually weakens.

teacher's question

In 1992, scientists drilled a 12km-deep hole on the Kola Peninsula, which is the deepest distance that humans have ever reached into the earth. If the earth is regarded as an orange with a diameter of 8cm, this depth is only equivalent to a 0.075mm deep hole in the orange peel. So, how do humans understand the mysteries deep in the earth?

explore

When a volcano erupts, magma with a temperature as high as 1,000°C and a large amount of gas and dust materials erupt from the ground, and the dust and smoke billow, covering the sky and the sun. Where do these substances come from? How did they spray to the ground?

This is how volcanoes erupt

The interior of the earth can release huge amounts of energy, making the heat energy in a certain area particularly concentrated. There, the high temperature melts the rock into molten magma, and gases are continuously released, putting the magma and gas under increasing pressure. If the overlying rock layers are weak or fractured, magma and gas will "take advantage of the void" and erupt from the depths of the earth, forming spectacular volcanoes.

Are there volcanoes in our country?

There are more than 600 volcanoes in our country, and they should not be distributed from the Northeast to Inner Mongolia. Inner Mongolia is the region with the most volcanoes in my country. Most of the volcanoes in our country are inactive, and Taiwan is now the most active volcano area in our country. The Penghu Islands, Taiwan Island, Diaoyu Islands, etc. are all volcanic islands formed by submarine volcanic eruptions. The famous Datun Volcano Group is composed of more than ten volcanoes.

What do volcanoes bring us?

Volcanic eruptions can bring huge disasters to humans. Magma and the rock fragments it carries will bury farmland, roads, villages and towns, causing casualties and economic losses. The gas and dust substances sprayed into the air will pollute the air and cause climate abnormalities. Volcanic activity can also form minerals, hot springs and fertile volcanic ash, and volcanic islands formed by submarine volcanic eruptions can provide valuable land for nearby residents. Studying volcanoes can also help us understand the Earth's internal structure.

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Update Time: 2024-08-30

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