"Will rocks change their appearance?" Earth's surface and its changes PPT

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"Will rocks change their appearance?" Earth's surface and its changes PPT

Part 1: Exploring the causes of rock changes

Rocks that look very solid, what force causes them to change? Let's explore this question experimentally.

The effects of cold and heat

Immediately place the heated rocks into cold water and repeat several times.

The volume of rock expands when heated and shrinks when cooled. Because the outer and inner layers of rock are heated unevenly, uneven expansion and contraction of the surface layer occurs, so that the rock slowly breaks and peels off. In nature, the thermal expansion and contraction of rocks due to temperature differences between day, night and seasons is a major cause of rock cracks.

The role of running water

Place a few rocks into a plastic bottle filled with water and shake vigorously.

Due to the transporting effect of water, streams and rivers often carry many stones and silt. These stones and silt collide and rub against each other under the impetus of the water flow, and also rub against the river banks and river beds. Finally, they The volume changes in size and shape. The stones become smaller and smaller, and the edges and corners are gradually worn away.

The role of plants

Pour the gypsum paste into the cup, sprinkle a few peas on it, pour some more gypsum paste, and put the caked gypsum paste into a dish filled with water. Observe the cast of peas after they sprout.

The growth of plants and the strength of their roots can also cause damage to rocks.

Will rocks change their appearance? PPT, Part 2: Weathering changes the topography

The weathering of rocks has changed the earth's topography and formed many beautiful landscapes. We go to the wild to find the masterpieces of nature.

Yunnan Lunan Stone Forest Huangshan Feilai Stone Zhangjiajie

Yaolin Wonderland in Tonglu, Zhejiang, Elephant Trunk Hill in Guilin, Husband and Wife Stone in Taimu Mountain, Fujian

Does our hometown have special geological landscapes? Consult relevant people and ask about the reasons.

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Update Time: 2024-09-17

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

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