"Topography and Topographic Maps" PPT courseware

Description

"Topography and Topographic Maps" PPT courseware

Part One: Review and Review

1. The terrain is above 500 meters above sea level, with relatively large heights, steep slopes, towering peaks and deep valleys ( )

A:Plain B:Plateau C:Mountain D:Basin

2. The place where the contour line protrudes from the lower point to the higher point is ( )

A: saddle B: cliff C: ridge D: valley

3. When reflecting the ups and downs of the land surface on a map, the method usually used is ()

A: Draw a floor plan B: Draw a contour map

C: Draw political district map D: Draw tourist map

Topography and topographic maps PPT, part 2: expansion exercises

Wangcun Town, located in a mountainous area, needs to choose one of the four locations A, B, C, and D as shown in the picture to build a hydropower station. Please use the knowledge you have learned about contour topographic maps to choose a location that is most suitable for building a dam and explain the reasons.

Near location C, because this location is a canyon, building a dam here can save labor and has the best water collection effect.

discuss:

In the eastern section of the Himalayas, there is the largest canyon in the world - the Brahmaputra Grand Canyon. How was it formed?

It turns out that the shape of the earth's surface is constantly changing, affected by both the internal forces of the earth and external forces, such as erosion and dissolution by running water, erosion by wind, and deposition of sand.

Terrain and topographic map PPT, part three: changes in terrain

Do external forces act the same in different regions?

Humid areas with abundant precipitation

Flowing water has the greatest impact on surface morphology. There are often karst terrains. The sediment carried by rivers is deposited in the middle and lower reaches of rivers and estuaries to form plains and deltas.

Arid areas with relatively little rainfall

The effect of wind is the most obvious. Under the influence of wind, deserts, Gobis, and wind-eroded castles appear.

Alpine areas

Forming horn peaks and cirque valleys.

Topography and topographic maps PPT, Part 4: Summary after class

changes in terrain

(1) The main external factors causing changes in surface morphology include

It is mainly affected by the weathering, erosion, transportation and sedimentation of wind, flowing water, glaciers, waves, organisms, etc.

(2) What are the differences between internal forces and external forces on the formation of the earth’s terrain?

The internal force causes the ground to form high mountains and deep valleys, making the surface more undulating. The impact is phased.

The main effects of external forces are to lower mountains, fill deep valleys, and flatten the surface. Has a slow, long-lasting effect.

(3) The shape of the earth’s surface is the result of the combined action of internal and external forces

Globally, internal forces dominate the surface morphology, while in local areas, external forces may also dominate.

Topography and topographic maps PPT, Part 5: Consolidation exercises

1: The reason why caves are formed in limestone areas is ( )

A: The effect of fire B: The effect of running water

C: The effect of wind D: Earthquake

2: Among the following functions, the one that belongs to internal force is ( )

A:wind B:flowing water C:volcano D:glacier

3: The flying rocks on the top of Huangshan Mountain are mainly affected by ( )

A: The effect of wind B: The effect of flowing water

C: The action of volcanoes D: The action of glaciers

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, terrain and topographic map PPT download, .PPT format;

For more information about the "Topography and Topographic Maps" PPT courseware, please click on the Topographic and Topographic Maps PPT tab.

"Topography and Topographic Maps" PPT:

"Topography and Topographic Maps" PPT Part One Content: Question: We know that the earth's surface has undulations, some are flat, some are steep, some are endless, and some are layered with obstacles. What do we collectively call them? Terrain So, what are the main types of terrain...

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Update Time: 2024-09-26

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

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