"Topography Changes Caused by Internal Movements of the Earth" Earth's surface and its changes PPT

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"Topography Changes Caused by Internal Movements of the Earth" Earth's surface and its changes PPT

Part One: Volcanoes and Earthquakes

In 1963, in the Atlantic Ocean south of Iceland, a fishing boat was operating on the sea surface. People suddenly saw the sea water there turbulent and rolling, and smoke columns rising into the sky. As a result, an island (Surtessee Island) rose from the sea surface within a day and night. Added a new land for the Republic of Iceland.

On April 2, 2007, an earthquake measuring 8 on the Richter scale occurred in the Solomon Islands. While triggering a tsunami and causing casualties, it suddenly "raised" an island called Ranonga by 3 meters, causing the coral reefs around the island to emerge from the water. .

On the evening of December 16, 1920, in a place in Ningxia, people who had worked hard for a day went home to rest. Suddenly, the earth made bursts of thunderous sounds, and then the cave dwellings where people lived collapsed one after another. Many cracks from several meters to tens of meters long appeared on the ground. Some villages were completely submerged in the loess. Big cracks opened up on some mountaintops, and the collapsed earth and stone statues rushed toward the lower areas in an unstoppable torrent, blocking a section of the river about 2,500 meters long, and soon formed a lake.

Topographic changes caused by the movement of the earth's interior PPT, part 2: Movement of the interior of the earth

The crust is a thin layer on the surface of the earth, with an average thickness of 17 kilometers, but the thickness varies from place to place. The average thickness of the land part is about 35 kilometers, while the average thickness of the ocean part is about 7 kilometers.

The average thickness of the earth's mantle is about 2,900 kilometers. It is home to liquid magma, but most of it is solid. Most earthquakes are caused by activity in the Earth's mantle.

The radius of the earth's core is about 3,470 kilometers, and the temperature is about 3,000°C, with a maximum temperature of 5,000°C. The earth's core is divided into an outer core and an inner core. According to the measurement of seismic wave propagation speed, the outer core may be liquid material, while the inner core may be solid material.

Earthquakes and volcanoes are caused by movements within the Earth. Most earthquakes occur within the earth's crust. Volcanic activity is related to movement of the mantle and crust.

In the deep parts of the earth, the temperature gets higher and the pressure gets higher and higher as you go down. The deep material of the earth is like a pot of hot porridge, constantly moving, driving the movement of the earth's surface and causing changes in the earth's surface.

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For more information about the PPT courseware "The Earth's Surface and Its Changes and Terrain Changes Caused by the Earth's Internal Movements", please click the Earth's Surface and Its Changes ppt Terrain Changes Caused by the Earth's Internal Movements ppt tag.

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Update Time: 2024-11-22

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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