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"Common Landform Types" Landform PPT Download
Part One: Preview of new knowledge
1. Aeolian landform
1. Concept and distribution: In arid areas, various landforms mainly formed by wind are collectively called aeolian landforms. my country's aeolian landforms are distributed in the northwest region.
2. Landform type
(1)Wind-eroded landforms
(2) Aeolian landform—sand dunes
① Common types: crescent-shaped sand dunes.
②According to their movement conditions, they can be divided into fixed sand dunes and mobile sand dunes. Moving sand dunes will bury houses and roads on the edge of the desert, and encroach on farmland and pasture.
(3) Special windy sand landforms: appear in sandy river valleys, sandy lakeshores and coasts with sparse vegetation.
Link Life During the summer vacation of 2019, while Zhang was traveling by car on the edge of the Tarim Basin in Xinjiang, he noticed that there was often vegetation coverage along the highway, and the vegetation extended along the highway.
2. Coastal landforms
1. Concept: The coast forms various landforms under the action of waves, which are collectively called coastal landforms.
2. Landform type
Bedrock coasts are widely distributed in my country's Shandong Peninsula, Liaodong Peninsula and Zhejiang, Fujian, Taiwan, Guangdong, Guangxi, Qiong and other provinces south of Hangzhou Bay. The most spectacular sight on the bedrock coast is the huge waves rushing from the sea that hit the cliffs and create towering water columns, making bursts of roars.
Combine the illustrations and what you have learned to summarize the characteristics of bedrock coasts.
It shows that the coastline is tortuous, with alternating headlands and bays, there are many harbors deep into the land, the beaches are narrow, and the water is deep.
Common landform types PPT, part 2: independent detection
1. Judgment of right and wrong
(1) The main external force responsible for the formation of wind-sand landforms is flowing water deposition. ()
(2) The Yadan landform distribution area is dominated by wind sedimentation. ()
(3) The prevailing wind blows from the gentle slope of the crescent-shaped dune to its steep slope, and the vegetation in front of the steep slope is slowly submerged by quicksand. ()
(4) The sandy coast is mainly composed of sand and gravel, with gentle slopes and clear water. ()
(5) Sea caves are formed after sea bridges are eroded by waves. ()
Answer(1)× (2)× (3)√ (4)√ (5)×
In the Fila Fila Desert of Egypt, there is a huge mushroom rock formation that looks like a sand sculpture standing on a solid layer of soil. It is called the "Mushroom Desert" by the locals. Read the picture and combine the knowledge you have learned to complete questions 2~3.
2. The geological processes that formed the “mushroom desert” are mainly ()
A.Wind erosion
B. River accumulation
C. Rock formation extrusion
D. Volcanic eruption
3. The most likely area where "mushroom desert" is distributed is ()
A. Humid area
B. Semi-humid zone
C. Semi-arid area
D. Dry area
Analyze question 2. The landscape shown in the picture is a wind-eroded mushroom formed by wind erosion. Question 3: Wind-eroded landforms are widely distributed in arid desert areas.
Answer 2.A 3.D
4. The mushroom-shaped landform in Yehliu Park on the northeastern coast of Taiwan shown in the picture below belongs to ()
A. Wind erosion landform B. Flowing water landform
C. Sea erosion landform D. Karst landform
Analysis Yehliu Park on the northeast coast of Taiwan is located in the coastal area. The mushroom-shaped landform is a sea erosion landform, formed by wave erosion.
AnswerC
Common landform types PPT, part three content: classroom exploration
The formation and impact of sandstorm landforms
Question exploration
Wind-eroded mushrooms refer to places where wind and sand are strong, and if the rocks exposed on the surface have well-developed horizontal joints and bedding, they can easily be eroded into strange shapes by wind. In particular, after long-term erosion of an isolated protruding rock, it will form a mushroom shape with the top larger than the bottom.
Explore with materials:
(1) Analyze the local geographical environment characteristics that are conducive to the formation of wind-eroded mushrooms.
(2) Analyze the differences between the upper and lower rock layers of the wind-eroded mushroom from the perspective of wind erosion.
Tips: (1) The climate is arid, dominated by wind erosion; there are many sandy sediments on the surface; there are many and concentrated windy days.
(2) There is a lot of sand and small stones in the wind near the ground, and the erosion ability is strong.
Lectures by famous teachers
1. Main differences in wind erosion landforms and landform characteristics
2. Formation and development of barchan dunes
3. Conditions for the formation of waterside dunes
(1) The dynamic conditions for the formation of sand dunes - prevailing winds, especially in areas where the sand is exposed to the water, where there are many windy days and the wind is strong.
(2) The material source of sand dune formation is sediment. The sediment content in rivers is large, and the water flow speed in this area is slow, and sediment is deposited on the river bed.
(3) Hydrological conditions for dune formation - river water levels decrease, and the sediment is exposed and dry.
Analysis of typical cases
Example 1 Yadan landform now generally refers to a wind-eroded landform in dry areas. The ground formed by earthy sediments in rivers and lakes has been formed by weathering, intermittent water erosion and wind erosion to form wind-eroded areas parallel to the prevailing wind direction and arranged alternately. A combination of mounds and wind-eroded depressions (troughs). The picture below shows two common Yadan landforms. Read the picture and complete the following questions.
(1) Picture A shows a flat-topped mountain-like Yadan. It is speculated that the main reason for the flat top of this landform is ()
A. Formed by wind accumulation
B. Wind erosion residue
C. Crustal movement produces terrain uplift
D. The accumulation of running water
(2) Picture B shows a whale-backed Yadan, which often appears in places with high speed and strong winds all year round. The reason for the difference in slope on both sides is ()
A. Gentle slope, formed by erosion of windward slope
B. Steep slope, formed by erosion of windward slope
C. Gentle slopes, accumulated on windward slopes
D. Steep slopes, accumulated on windward slopes
Literacy Concept This question tests the comprehensive thinking of the formation process of Yadan landform.
To analyze question (1), the Yadan landform first experienced the accumulation of flowing water, forming a flat landform. Later, due to the increasingly arid climate, the dry lake bottom often cracked due to shrinkage. The wind blew along these cracks, and the cracks became wider and wider. As it grows larger, the originally flat ground develops into many irregular dorsal fin-shaped ridges and wide shallow grooves, forming this flat-top mountain-like Yadan landform with a flat top, so D is selected. Question (2): The whaleback-shaped Yadan landform often appears in places with strong winds all year round. Due to long-term erosion by strong winds, the rock erosion on the windward slope is relatively serious, gradually forming a steep terrain. The other side is located on the leeward slope. The erosion is weak and the slope is relatively gentle, so B is chosen.
Answer(1)D (2)B
Common landform types PPT, part 4: In-person detection
1. The uncanny workmanship of nature has formed many natural "bridges". The picture below shows several "natural bridges" formed by erosion. The correct statement about the "Tsien Bridge" in the picture is ()
A. Figure A is mainly formed by the accumulation of wind.
B. Picture B is mainly formed by the erosion of flowing water.
C. The landform type of Figure C is widely distributed in North my country
D. Tintu is more common in arid and desert areas
Analysis Loess "bridges" are formed by the erosion of flowing water and are mainly distributed in the Loess Plateau area. A is wrong; sea erosion "bridges" are landforms formed by sea erosion and are mainly distributed in coastal areas. B is wrong; the distribution of dissolution "bridges" in karst landforms In areas where limestone is widely distributed, it is a landform formed by the dissolution of flowing water. C is incorrect. Wind erosion "bridges" are wind erosion landforms, mainly distributed in arid areas in northwest my country. D is correct.
AnswerD
The picture below is the landscape of the famous Urho Devil City in the Junggar Basin of Xinjiang. Complete questions 2~3 accordingly.
2. The main geological process that formed the landscape of the Devil’s City surrounded by walls and rugged rocks is ()
A. Accumulation by flowing water B. Accumulation by wind
C. Glacial erosion D. Wind erosion
3. Which natural environment is most closely related to the formation of the landform in the Urho Devil City area ()
A. High altitude, small annual temperature range
B. The mountains are high and the valleys are deep, and the water flow is rapid and the drop is large.
C. Deep inland, with less precipitation and strong winds
D. Cold winters and hot summers, with seasonal changes in precipitation
Analyzing question 2, Devil City is the Yadan landform in the northwest region. Its formation is closely related to the climate. The northwest region has an arid climate and strong winds, so the main geological process is wind erosion. Question 3: The landform of Devil City is a wind-eroded landform. Wind action mostly occurs in arid and semi-arid areas. The northwest region is deep inland and far away from the ocean. It has little precipitation, sufficient sunlight, and very windy weather, so choose C.
Answer 2.D 3.C
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