"The Shape and Internal Structure of the Earth" PPT download

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"The Shape and Internal Structure of the Earth" PPT download

Part One: The Shape of the Earth

What is the shape of the earth? You describe it.

The Earth is an approximately spherical planet.

But what did the earth look like to people in ancient China?

The sky is round,

The land is square.

Why is there such a big gap between the ancients' understanding of the earth and your understanding of the earth?

Due to the small scope of activities, the cognitive ability is very limited.

The ancient Chinese took it for granted that the earth was square and the sky was round.

The shape and internal structure of the Earth PPT, Part 2: The size of the Earth

Why do we need to introduce the length of 2 radii?

Did you discover anything from it?

Because the Earth rotates around its axis, it is a sphere that is slightly flattened at the poles and slightly bulging at the equator.

If a middle school student’s arms are 1.5m long when stretched flat, how many middle school students will be needed to hold hands and hug the earth along the equator?

40000000 m ÷ 1.5 m / piece ≈ 26666667 pieces

The shape and internal structure of the earth PPT, the third part: the internal structure of the earth

Earth's crust: from the surface to __________ kilometers below the surface;

Mantle: from the lower boundary of the earth's crust to __________ kilometers; (divided into upper mantle and lower mantle)

Earth's core: from the lower boundary of the earth's mantle to the center of the earth (divided into __________ and __________)

The shape and internal structure of the earth PPT, part 4: practice

1. The phenomenon that cannot prove that the earth is a sphere is ----- ( )

A. The sun rises in the east and sets in the west

B. Earth satellite photos

C. The formation process of total lunar eclipse

D. The process of the sailboat gradually disappearing in the distance in the sea

2. There is an activity in the textbook called "Pencil moving between a basketball and a wooden board". This activity proves that the reason why the hull of the sailing ship disappeared before the mast was ----- ( )

A. The size of the ship

B. The sea surface where the ship moves is a sphere.

C. The distance of the ship from the observer

D. The length of the mast

3. From the outside to the inside, the earth can be divided into ----- ( )

A. Lithosphere, mantle, core

B． Lithosphere, asthenosphere, core

C． Crust, mantle, core

D． Earth's core, mantle, crust

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, PPT download of the shape and internal structure of the earth, .PPT format;

For more information about the "Shape and Internal Structure of the Earth" PPT courseware, please click the Shape and Internal Structure of the Earth ppt tag.

"The Shape and Internal Structure of the Earth" PPT courseware:

The first part of the PPT courseware "The Shape and Internal Structure of the Earth": Understanding the shape of the earth: The ancient Indians in the Western Zhou Dynasty believed that the earth was a round shield, carried by three elephants, and the elephants Standing on the back of a big turtle again. in life..

"The Shape and Internal Structure of the Earth" PPT:

"The Shape and Internal Structure of the Earth" PPT Part One: The Shape of the Earth What does the Earth look like? The Theory of Covering the Sky in the Western Zhou Dynasty: The sky is round and the place is square. According to the Astronomical Chronicles of the Book of Jin, the sky is like a bamboo hat and the earth is like a covering plate. Ancient Indians believed that the earth was a round shield carried by three elephants...

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Update Time: 2024-10-20

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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