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

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

Part 1: Understanding the shape of the earth:

The "Supreme Sky Theory" of the Western Zhou Dynasty - The sky is round and the place is round

Ancient Indians believed that the earth was a round shield carried by three elephants, and the elephants stood on the back of a large turtle.

Evidence that the earth is spherical in life

① Coastal boat viewing

When the ship came to the shore, the mast and mast of the ship were first seen, and the hull was finally seen.

②Climb high and look far

There is an old poem that goes: "If you want to see a thousand miles away, go to a higher level."

③Lunar eclipse----Aristotle

④Magellan’s voyage route

⑤The true shape of the earth

The blue part is the ocean (71% of the earth’s surface area)

The yellow part is land (29%)

The white part is the white clouds floating in the sky

The earth is an irregular sphere of _________ and _________.

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

1. The Earth is a sphere that is slightly flattened at the poles and slightly bulging at the equator.

2. The radius in the pole direction is about 21 kilometers smaller than the equatorial radius. The difference is only 0.33%.

Radius of the Earth: polar radius__________ equatorial radius__________.

Circumference of the Earth at the equator: 40,000 km

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

The earth can be divided into three layers: crust, mantle, and core from outside to inside.

The crust and the top of the mantle (above the asthenosphere) together form the lithosphere

The shape and internal structure of the Earth PPT, Part 4 content: Classroom exercises:

1. The earth is a sphere with ______ at the poles and ______ at the equator.

2. Its equatorial radius is ______ kilometers. The poleward radius is ______ kilometers shorter than the equatorial radius.

3. The equatorial circumference of the Earth is approximately ______.

4. The following phenomena cannot prove that the earth is a sphere ()

A. Solar eclipse phenomenon

B. Magellan led his fleet to circumnavigate the earth.

C. For ships approaching on the sea, the mast appears first

D. Photos of the Earth taken by the Hubble Telescope

5. If you go out to sea by boat, you will see the lighthouse in the port ( )

A. The whole thing suddenly disappeared from sight

B. Disappear from the field of vision in sequence from top to bottom.

C. Disappear from the field of vision in sequence from bottom to top.

D. The top and base of the tower disappear from sight at the same time

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 download:

"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 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: 2024-09-19

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

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