"Will Rocks Change Their Appearance" PPT download of Earth's surface and its changes

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"Will Rocks Change Their Appearance" PPT download of Earth's surface and its changes

Part One Content: Exploration Activities

1. The effects of cold and heat

Experimental materials: alcohol lamp, tweezers, sink, stones

The purpose of the experiment is to explore the effects of cold and heat on rocks

Experimental steps 1. Use tweezers to hold the stone and heat it on an alcohol lamp;

2. Immediately put the stones into cold water after heating;

3. Repeat several times.

Experimental phenomenon: the stone breaks into small pieces

Conclusion: Due to the interaction of hot water and cold water, the temperature difference changes cause the rock to expand and contract with heat, causing the rock to crack.

2. The function of running water

Experimental materials: stones, water, bottles

The purpose of the experiment is to explore the effect of running water on rocks

Experimental steps 1. Put the stones into the bottle and add half a bottle of water;

2. Shake repeatedly.

Experimental Phenomenon The volume and shape of the stone changed.

Conclusion: Due to the transport of water, the stones collide and rub against each other under the push of the water flow, and finally their size and shape change. The edges of the stones become rounded, and many small stones appear in the bottle.

Will rocks change their appearance? PPT, part 2: expansion and extension

Rocks are naturally produced mineral or glass aggregates with a stable appearance, which are combined in a certain way and are the material basis of the earth's crust and upper mantle.

According to their origin, they are divided into igneous rocks, sedimentary rocks and metamorphic rocks.

When the earth was first formed, it became rocks. After weathering, it turned into rocks. Then it turns into a meteorite. The so-called meteorite is the debris left behind by a miniature version of an asteroid that "hit the earth". Hundreds of millions of years have passed, and there are countless rocks in the world.

Will rocks change their appearance? PPT, Part 3: Summary of this lesson

The phenomenon of changes in rocks under the long-term combined action of atmosphere, water, temperature or animals and plants is called weathering.

Weathering can change topography.

Will rocks change their appearance? PPT, Part 4: Classroom exercises

1. Judgment

1. The weathering of rocks has changed the topography of the area and formed many beautiful landscapes. ( )

2. The rocks on the mountain are full of cracks, and a lot of gravel and sand are often accumulated at the foot of the mountain. ( )

3. The weathering process of rocks is very rapid. ( )

2. Fill in the blanks

1. The weathering of rocks can change the earth’s ( ).

2. The phenomenon of rocks changing under the long-term combined action of atmosphere, water, temperature or animals and plants is called ( ).

3. The earth’s crust is composed of ( ).

Will rocks change their appearance? PPT, Part 5: Homework

Investigate the natural landscape of your hometown and the causes of its formation.

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For more information about the PPT courseware "The Earth's Surface and Its Changes Will Rocks Change Their Appearance", please click the Earth's Surface and Its Changes ppt Will Rocks Change Their Appearance ppt tag.

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Update Time: 2024-07-30

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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