"Geological Disasters" Natural Disasters PPT

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"Geological Disasters" Natural Disasters PPT

Part One Content: Learning Objectives:

1. Recognize the main types and characteristics of geological disasters. (emphasis)

2. Understand the causes and defensive measures of geological disasters such as earthquakes, landslides, and debris flows. (important and difficult points)

Natural disaster PPT, part 2: independent preview and exploration of new knowledge

1. Earthquake

1. The mechanism

_______ accumulation in the earth's crust. →The rock layers are fractured or dislocated.→The energy is released sharply.→Seismic waves propagate and cause the ground to shake.

2. Metrics

(1) Magnitude: represents the _______ size of the earthquake. An earthquake only has _______.

(2)Intensity

①Meaning: Indicates the impact and _______ on the ground in a certain area during an earthquake.

②Characteristics: The greater the intensity, the more serious the damage; an earthquake can have _______ intensity.

③Influencing factors: earthquake magnitude, focal depth, _______, ground buildings, etc.

3. Main hazards

(1) Cause the collapse of buildings, _______, pipelines, communications and other infrastructure.

(2)Cause_______ and property damage.

(3) Cause disasters such as _______, landslides, _______, fires, tsunamis, toxic gas leaks, and the spread of epidemics.

(4) Destroy the local resources, environment and ecosystem, and seriously damage the ____________ of people in the disaster area.

4. distributed

(1)World

Ring_______seismic zone

Mediterranean - _______ zone

(2)China

①Characteristics: wide range, _______, high intensity, serious disaster.

② Frequently occurring areas: _______, Tibet, Xinjiang, Qinghai, Yunnan, Sichuan, etc.

2. Landslides and debris flows

1. landslide

(1) Mechanism of occurrence

(2) Distribution characteristics: _______ are relatively fragmented, _______ are large in terrain, mountainous _______ areas with poor _______ and areas with frequent engineering construction.

2. mudslide

(1) Meaning: A special torrent containing a large amount of sediment and stones in mountainous valleys caused by heavy rain or melting of ice and snow.

(2) Conditions for occurrence

Terrain ______, rich in loose material

A large number of

Natural Disasters PPT, Part 3: Collaborative exploration to overcome difficult problems

earthquake disaster

On March 6, 2019, the Ministry of Emergency Management, together with multiple departments, consulted and analyzed the national natural disaster situation in February and determined that in February, a total of 8 earthquakes of magnitude 4 or above occurred in mainland my country, including 1 earthquake of magnitude 5 or above. Among them, earthquakes with magnitude 4 or above in Rong County, Sichuan caused relatively heavy losses: the earthquake disaster caused a total of 44,000 people to be affected, 2 people died, more than 3,200 people were urgently relocated, 11,000 houses were seriously damaged, 44,000 houses were generally damaged, and direct economic losses were 25,000 yuan. billion.

Question 1 (Comprehensive thinking) What is the reason for the frequent earthquakes in my country?

Tip: my country is located at the junction of the Eurasian plate, the Pacific plate and the Indian Ocean plate, and the crustal activities are active.

Question 2 (Regional Awareness) What other areas in my country have frequent earthquake disasters?

Tips: Taiwan, Tibet, Xinjiang, Qinghai, Yunnan, Sichuan, etc.

Question 3 (Comprehensive thinking) What are the characteristics of earthquake disaster losses in my country?

Tip: The east is heavier and the west is lighter, the earthquake death toll will decrease, and the economic losses will tend to increase.

Natural Disasters PPT, Part 4: Competing Literacy Standards and Solidifying Basics

1. In the figure, the one with the largest seismic distance among ①②③④ is ()

A. ① B． ②

C． ③D. ④

2. What may be located near the epicenter is ()

A． ① B． ②

C. ③D. ④

1.A　2.D　For question 1, according to the diagram and table information, it can be seen that the intensity at ① is the smallest and the isochoric distance should be the largest. Question 2: The intensity is greatest at ④ in the picture, which may be located near the epicenter. ]

3. Our country is a country with many disasters. Among the following areas, debris flow and landslide disasters occur frequently in ()

A． Inner Mongolia Plateau B. Yunnan-Guizhou Plateau

C. Shandong hills D. North China Plain

B. Debris flows and landslides are prone to occur, and at least two conditions must be met: first, the rugged surface form; second, there must be abundant precipitation, so among the four regions, the Yunnan-Guizhou Plateau is prone to debris flows and landslides. ]

4. The different conditions for debris flows and landslides to occur are ()

A. The terrain is undulating

B． Rich in loose matter

C. Poor vegetation cover

D. A large amount of water flows in a short period of time

D. Landslides and debris flows are both natural disasters in mountainous areas. The conditions for their occurrence are also similar. However, the occurrence of debris flows requires the participation of water, while landslides do not. ]

Keywords: Free download of PPT courseware for high school geography compulsory course 1 of the People's Education Press, natural disaster PPT download, geological disaster PPT download, .PPT format;

For more information about the "Natural Disasters and Geological Disasters" PPT courseware, please click on the "Natural Disasters ppt Geological Disasters ppt" tag.

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Update Time: 2024-09-09

This template belongs to Geography courseware People's Education Press High School Geography Compulsory Course 1 industry PPT template

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