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Authoritative PPT Summary
"The Internal Structure of the Earth" The Unquiet Earth PPT Courseware
Import new lesson
1. Explore the shadow 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
Now that the students know the shape of the earth, what does the inside of the earth look like? Humanity's understanding of the earth's interior is not as simple and convenient as opening an orange to see what's going on. Scientists can still use various methods to detect the earth's internal structure.
Explore new knowledge:
Humanity's understanding of the earth's internal structure is based on some natural phenomena on the earth's surface and the detection of seismic waves.
Based on this, scientists divide the interior of the earth into different layers. The thin layer on the surface of the earth is called the crust, which is mainly composed of various rocks; the central part of the earth is called the core; the layer between the crust and the core is called the earth's core. The part is called the mantle.
Earth's crust: 33 kilometers
Mantle: 2900 km
Earth's core: 3470 kilometers
Consolidation exercises
1. Question: How many layers can the interior of the earth be divided into?
2. What is the thickness of the three and what are they mainly composed of?
3. Ask students to use a cooked egg analogy to help them understand the internal structure of the earth.
Summary and expansion
Overtalk: How did humans learn about the Earth’s interior?
Summary: The division of the earth's crust, mantle, and core is inferred based on the difference in refraction of seismic waves. There are still many secrets inside the earth waiting for us to study.
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"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 4:
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"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 3:
"The Internal Structure of the Earth" Unquiet Earth PPT Courseware 3 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 I...
"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...