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"The Internal Structure of the Earth" The Unquiet Earth PPT Courseware 3
Take a guess
The three boxes A, B, and C contain different items. How can you guess what's in the box without opening it?
Weigh the weight
listen to the sound
smell the smell
It seems that we can understand his internal situation by collecting some information about unknown things. Likewise, for Earth, we can:
By collecting information from the Earth's interior, we can detect the structure of the Earth's interior.
Discuss
Where do scientists gather information about the Earth's interior?
Scientists have finally found a way to use seismic waves to uncover the mysteries of the Earth's depths.
Earthquake wave features:
It propagates faster in hard rocks and slower in softer rocks, and refraction occurs at the interface between rocks of different hardnesses.
read it
The journey of mankind’s understanding of the earth’s internal structure:
In 1910, former Yugoslavian seismologist Mohorovich accidentally discovered that seismic waves were refracted 50 kilometers underground. He believed that this zone where refraction occurs is the interface between the earth's crust and different materials below the earth's crust.
In 1914, German seismologist Gutenberg discovered that there was another interface between different materials 2,900 kilometers underground.
Later, in order to commemorate them, people named the two surfaces "Moho surface" and "Gutenberg surface" respectively. Based on these two surfaces, the earth was divided into three layers: crust, mantle and core.
Little knowledge about the earth
Crust: The outermost layer of the earth. If the entire earth is compared to an egg, then the crust is equivalent to the eggshell. The thickness of the crust varies from place to place. It is thicker in mountainous areas and thinner in oceanic areas. The average thickness of the entire crust is about 18 kilometers (the average thickness of the continental part is 35 kilometers). The earth's crust is mainly composed of rock.
Mantle: Below the earth's crust is the middle layer of the earth, called the "mantle", which is about 2,900 kilometers thick and is mainly composed of dense rock-forming materials. This is the largest and most massive layer inside the earth.
Earth's Core: The Earth's core is the core of the Earth, which is mainly composed of iron and nickel elements and is about 3,500 kilometers thick. The Earth's core is divided into two parts: the outer core and the inner core. The core accounts for 16% of the earth's total mass, the mantle accounts for 83%, and the crust, which is most closely related to people, only accounts for 1%.
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"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 4:
"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 4 Moho The Moho is located at a depth of 30-40km below the surface. After reaching this interface, the average speed of longitudinal waves suddenly rises from 6-7km/s to 8.1km/s , this mutation is global. This was done by scholars from the former Yugoslavia..
"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 2:
"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 2 Learning Objectives 1. Be able to infer the internal structure of the Earth based on some natural phenomena. 2. Be able to make a model of the earth's structure. 3. Know the internal structure of the earth. This is a photo of Earth's Antarctica, which is...
"The Internal Structure of the Earth" Unquiet Earth PPT courseware:
"The Internal Structure of the Earth" Unquiet Earth PPT courseware Import new lesson 1. Explore the dark box: There are three boxes on the table, containing water, fine sand and small stones. 2. How can you guess what’s in the box without opening it? Student exchange with...