"Crustal Movements and Volcanic Earthquakes" PPT

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"Crustal Movements and Volcanic Earthquakes" PPT

Part One: Please take a guess

What could be the reason for this?

Qinghai-Tibet Plateau

A traveler who was trekking on the Qinghai-Tibet Plateau picked up a small stone from the rock formations on the roadside while resting and was attracted by the lines on the stone. He couldn't help but take a closer look and was surprised to find that it was a fossil of an ancient marine life!

Tens of millions of years ago, the Qinghai-Tibet Plateau was once an ocean.

It also tells us that the earth’s crust is changing!

Reading pictures: Lifting and lowering of marble

(1) How did the earth’s crust change from the time it was built to the fifteenth century?

(2) How did the earth’s crust change from the 15th century to the 18th century?

(3) How did the earth’s crust change from the 18th century to 1955?

Crustal changes and volcanoes and earthquakes PPT, part 2: Please give it a try

1. Take a book and place it flat on the table, then hold both ends and press hard toward the middle to bend the book.

2. Take a piece of paper, hold both ends with your hands, and pull hard.

The same goes for changes in the earth’s crust!

Discussion: How were these mountains formed?

Horizontal rock layers bend or break under ____________, which is the most important reason for the formation of _____ on Earth.

Since the formation of the Earth's crust, its structure and surface morphology have been constantly changing. The deformation of rocks, changes in sea and land, and various surface forms are all the result of __________.

Crustal changes and volcanoes and earthquakes PPT, Part 3: Class discussion

Discussion: What beneficial or adverse impacts will volcanic activity have on human production and life?

The adverse effects are disrupting traffic, burying farmland, causing fires, and even endangering human lives.

The beneficial impact is that volcanic ash and volcanic dust can provide inorganic fertilizers for farmland, and the volcanic crater can enrich a large number of minerals, such as sulfur ore; at the same time, the volcanic lake formed by the volcanic crater has great value in medical and health care; it forms hot springs wait.

Crustal changes and volcanoes and earthquakes PPT, Part 4: Classroom exercises

1. From outside to inside, the earth can be divided into ( )

A. Lithosphere, mantle, core B. Lithosphere, asthenosphere, core

C. Crust, mantle, core D. Core, mantle, crust

2. Regarding the statement about the lithosphere, which one is correct ( )

A. The lithosphere is a part of the earth’s crust

B. The lithosphere is part of the earth’s mantle

C. The lithosphere refers to the earth’s crust

D. The lithosphere is composed of the crust and part of the mantle

3. Which of the following information cannot prove crustal changes ( )

A. Curved rock formations on the cliff

B. Remains of ancient humans at the bottom of the ocean

C. There are large collapsed rocks in the river valley

D. Fossils of marine organisms on the Qinghai-Tibet Plateau

4. Volcanic magma originates from the ____ layer inside the earth

5. Japan’s sacred mountain is ______. It erupts periodically, so it is a ______.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, crustal changes and volcanic earthquakes PPT download, .PPT format;

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"Crustal Movements and Volcanic Earthquakes" PPT courseware:

The first part of the PPT courseware "Crustal Changes and Volcanic Earthquakes": The Legend of the Formation of the Himalayas. Regarding the formation of the Himalayas, the Tibetan people have a legend: a long time ago, there was an endless sea with a forest on the shore. Birds and beasts are...

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Update Time: 2024-09-10

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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