"The Formation of Pebbles" Changes in the Earth's Surface PPT Courseware 2

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"The Formation of Pebbles" Changes in the Earth's Surface PPT Courseware 2

formation of pebbles

Have you ever seen pebbles?

What do they look like?

Observe the pictures and objects and talk about the characteristics of the pebbles.

Characteristics of pebbles: Pebbles, regardless of size, are shaped like bird eggs, smooth and round.

Self-study the content on pages 35-36 of the textbook and answer the following questions.

Where should the pebbles appear?

Could you please estimate and guess how pebbles are formed?

Experiment 1: Simulating the thermal expansion and contraction of rocks

How to heat rocks?

How to cool down rocks quickly?

Have the rocks changed?

other reasons:

Loose mountains: earthquakes, mudslides, landslides, etc.

The role of water: When water in rock crevices freezes, it expands and cracks the rock.

The formation of pebbles (2):

The raw materials from which pebbles are formed have been found. But how do stones with different shapes and sharp edges turn into smooth, round pebbles?

Experiment 2: Simulate the changes caused by stones being washed away by running water.

Think about the formation process of pebbles in comparison.

Summary: Pebble Formation

The first stage: Due to the weathering of the rocks on the mountains on both sides of the upper reaches of the river, many stones of different sizes are formed.

The second stage: These stones are washed by the flowing water, slowly move downstream, and are continuously rounded by the water flow. After a long period of time, it gradually turns into pebbles.

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"The Formation of Pebbles" Changes in the Earth's Surface PPT Courseware:

"The Formation of Pebbles" Changes in the Earth's Surface PPT Courseware Experiment 1: Simulating the Thermal Expansion and Contraction of Rocks How to heat rocks? How to cool down rocks quickly? What happened to the rocks? Weathering Changes in temperature: thermal expansion and contraction cause cracks in rocks. water..

"The Formation of Pebbles" Changes in Ground Form PPT Courseware 2:

"The Formation of Pebbles" Changes in Ground Form PPT Courseware 2 Characteristics of Pebbles: Regardless of size, pebbles are shaped like bird eggs, smooth and round. What are the characteristics of the rocks in the upper, middle and lower reaches of the river? What is the pattern of the distribution of rocks? Upstream: Big rocks...

"The Formation of Pebbles" PPT courseware on changes in ground form:

"The Formation of Pebbles" PPT courseware on changes in ground form. What is the name of the stone in the picture? What are the characteristics? Smooth Round What are the characteristics of the distribution of stones in rivers? The stone is large, with sharp edges and corners, and the surface is rough. The stone is large, with sharp edges and corners, and the surface is...

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Update Time: 2024-10-01

This template belongs to science courseware People's Education Press Fifth Grade Science Volume 2 industry PPT template

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