"Volcano" PPT download

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"Volcano" PPT download

Part One: Learning Objectives

1. Be able to speculate on the causes of volcanic eruptions based on simulation experiment results;

2. Be able to explain the hazards and benefits caused by volcanic eruptions from both positive and negative aspects.

Part Two: Research Questions

How are volcanoes formed?

The causes of volcanoes

The deeper you go into the earth's crust, the higher the temperature and the greater the pressure. Magma moves upward through gaps or cracks in the rock like molten glass. As magma continues to rise, when it encounters a weak crust, it will erupt out of the surface and form a volcano. Volcanic eruptions are sometimes accompanied by earthquakes.

Internal structure of the earth:

The outermost layer of the Earth is the crust, which is mainly composed of rock, with an average thickness of 17 kilometers; below the crust is the mantle, which is a layer of hot upward-flowing liquid with a thickness of about 2,900 kilometers; the central part of the Earth is called the core, which is It is composed of outer core and inner core. The outer core is made of hot liquid metal, while the inner core is made of solid metal. The earth is like an egg, the crust is equivalent to the thin eggshell, the mantle is equivalent to the egg white, and the core is equivalent to the yolk.

Part Three: Dangers and Benefits of Volcanoes

Dangers of volcanoes:

Volcanic eruptions can pollute the air, burn forests, destroy farmland, and cover villages and cities. They are a serious natural disaster.

Benefits of volcanoes

It can create some land resources for humans. This land resource, like the Hawaiian Island, was all erupted by volcanoes. Now it is land, and it is the land of the United States. Moreover, the Great Hawaiian Island has volcanic eruptions and magma almost every year. After flowing to the seaside, it solidifies there and becomes land, expanding the territory; if the volcanic eruption is strong, it can expand to several square kilometers a year, or more. These islands are basically formed by volcanic eruptions.

Volcanoes can create many natural landscapes. I can say without exaggeration that most of the world's most famous scenic spots are volcanic areas, such as Yellowstone Park in the United States, Hawaii, Mount Fuji in Japan, Changbai Mountain in our country, Wudalianchi, and others. Natural landscape.

The relationship between volcanoes and human life (benefits):

1. Volcanic ash is rich in minerals and is suitable for the growth of crops;

2. Volcanic rock is a high-quality building material;

3. Transform the terrain to create scenic tourist attractions or rich geothermal resources.

Part 4: Classification of volcanoes

active volcano

Refers to modern volcanoes that are still active or have periodic eruptions. This type of volcano is in a period of peak activity.

extinct volcano

Extinct volcanoes refer to volcanoes that have erupted in prehistoric times but have never been active during human history. This type of volcano has lost its ability to move because it has not erupted for a long time. Such as the Datong volcano group in Shanxi, my country.

dormant volcano

Dormant volcanoes are volcanoes that have erupted in history. But the volcano has been relatively static for a long time. Such volcanoes have well-preserved volcanic shapes and are still capable of volcanic activity. For example, Tianchi in Changbai Mountain in Jilin Province, my country, erupted twice in 1327 and 1658, and there were many activities before that.

Part Five: Compliance Testing

1. Fill in the blanks:

1. Volcanic eruption is a serious ( ) disaster.

2. ( ) resources are renewable resources brought to us by volcanic eruptions.

2. Judgment:

1. Volcanic eruptions are the result of violent movements within the earth. ( )

2. Volcanic activity cannot be predicted. ( )

3. my country’s tourist resorts Wudalianchi and Changbai Mountain were formed by volcanic eruptions. ( )

4. Although volcanic eruptions are very harmful, they also have a powerful side, bringing us rich minerals, building materials, geothermal resources, beautiful natural landscapes, etc. ( )

Part Six: Summary and Assignments

1. Explain the dangers and benefits caused by volcanic eruptions from both positive and negative aspects?

2. Read Verne's science fiction novel "Journey to the Center of the Earth" and write a short science fiction essay about the interior of the earth.

Keywords: Qingdao version fifth grade science PPT courseware for the second volume free download, volcano PPT courseware, .PPT format;

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Update Time: 2024-07-01

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