"Earthquake" The Unquiet Earth PPT Courseware

Description

"Earthquake" The Unquiet Earth PPT Courseware

The Earth's lithosphere is divided into six major plates

Some plate boundaries squeeze each other, and some pull each other apart.

Explore the formation of earthquakes

We already know that the internal structure of the earth is divided into three layers: core, mantle, and crust. The earth's crust is composed of six large plates and twelve small plates. These plates are still in constant motion. Combined with the crustal structure and the scene of earthquakes, please guess how earthquakes are formed and tell them. The basis for your conjecture.

Experiment (1):

We use a wooden stick to observe what changes will occur under the action of external forces?

Experimental requirements:

Hold both ends of the wooden bar with both hands, slowly bend it with force, and continue to press hard. What happens to the wooden bar? What sound do you hear? How do your hands feel?

Causes of earthquakes

The earth is divided into three parts, the core, the mantle, and the crust. We live on the earth's crust. The earth's crust is composed of different plates. These plates are constantly moving. During the movement, they will continue to squeeze or stretch each other. The rock layers will deform and form folds. When the pressure on the rocks is high, When it reaches a certain level, rupture occurs and an earthquake occurs.

earthquake monitoring

Earthquake disaster is the natural disaster that poses the greatest threat to human life and property, and is known as the first of all disasters. What are the specific hazards of earthquakes? Who can tell me?

Earthquake hazards

Earthquake is a very destructive natural disaster. In addition to directly causing house collapses, landslides, ground cracks, liquefaction of sand and soil, and sand blasting, earthquakes can also cause fires, explosions, poisonous gas spread, floods, landslides, and mudslides. , plague and other secondary disasters. In addition, the social disorder, production stagnation, family destruction, life hardship and people's psychological damage caused by earthquakes often cause greater direct losses than the earthquake!

Main hazard categories:

①Destruction of buildings and structures. Such as house collapse, bridge breakage, dam cracking, railway track deformation, etc.

② Ground damage. Such as ground cracks, collapse, water spray and sand, etc. Destruction of natural objects such as mountains. Such as landslides, landslides, etc.

③ Huge waves caused by tsunamis and submarine earthquakes wash up on the coast, causing damage to coastal areas.

In addition, in some major earthquakes, people and animals are burned by light from the ground. After the direct disaster of an earthquake occurs, secondary disasters will occur. Sometimes, secondary disasters cause greater casualties and losses than direct disasters.

Example: During the Great Kanto Earthquake in Japan in 1932, only 10,000 houses collapsed directly due to the earthquake, but 700,000 houses were burned down by fires during the earthquake.

I'm going to think about this:

If there is an earthquake, should students hide under the table or hide beside the table? Which approach is correct?

What you must know about the "Earthquake Survival Triangle"

What is the earthquake survival triangle?

When an earthquake occurs, you must find a space that can form a triangle area to take shelter.

If an earthquake occurs, you cannot do this

1. Hiding under tables, under beds and in cars

2. Stand against the wall or squat down

3. Stand by the door frame

If an earthquake occurs, here's what you should do:

1. Quickly find a large, solid object

2. Move closer to its side

3. Try to curl your body as low as possible

Latest self-help advice: Don’t hide under the table

When the ceiling of a building collapses due to a strong earthquake, furniture such as tables and beds will be crushed. If people hide in it, the consequences will be disastrous. If people hide next to tables and beds, the furniture can first be affected by the force of the collapsed objects, allowing people on the side to obtain it. living space.

The latest self-rescue advice: If you encounter an earthquake while driving, you should get out of the car as soon as possible. Many people who died in the parking lot during the earthquake were crushed to death in the car. The people between the two cars were not injured at all.

The latest self-rescue advice: When a strong earthquake occurs, if you are in the parking lot, do not stay in the car to avoid the falling ceiling crushing the car and causing injury; you should hide next to the car in a lying position, and the falling ceiling will crush the car. In the car, it will not directly hit the person, and it may form a "living space" to increase the chance of survival.

Principles to be followed for mutual rescue after earthquakes

①Rescue those who are near first, then those who are far away.

② Put the easy things first and then the difficult ones. Rescue the lightly wounded, young adults and medical staff first to increase the number of helpers and strengthen the rescue team;

③) Save “lives” first, then “people”;

④ Listen carefully (pay attention to the shouts, groans, and knocks of the trapped people);

⑤ Carefully determine the location of the trapped person, and do not dig or plan blindly to prevent accidental casualties.

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For more information about the PPT courseware "Earthquake and Unquiet Earth", please click the Earthquake ppt and Unquiet Earth ppt tag.

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Update Time: 2024-11-16

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

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