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Qingdao Edition Fourth Grade Science Volume 1	pptx	6 MB

"The Discovery of the Navigator" PPT

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Upload Time: 2024-11-02

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"The Discovery of the Navigator" PPT

Part One: Discussion of Problems

Discussion: What do you think it is? Why?

There is brown earth and blue ocean, so the earth is a beautiful sphere surrounded by white clouds.

Ancient people’s view of the earth:

1. Ancient Indians’ view of the earth

2. The ancient Egyptians’ view of the earth

3. Ancient Chinese people’s view of the earth—the theory of a round sky and a round place

Part 2: Strait of Magellan

In 1519, Magellan led a Spanish fleet composed of five sailing ships and 265 sailors across the Atlantic Ocean to the east coast of South America, and finally found a strait - later called the Strait of Magellan.

Why did the ancients think the earth was shaped like that?

If you were an ancient person two thousand years ago, how would you imagine the earth beneath your feet and the sky above you?

If you had the ability of Sun Wukong, would you somersault and fly to the horizon?

How do you know the shape of the earth?

What factual evidence is there to support your point?

Part Three: Thinking

1. What do you see when you move the paper sailboat on the wooden board? Will paper sailboats disappear?

2. When you move the paper sailboat on the ball, what do you see? Will paper sailboats disappear?

3. Why can’t the pencil tip be observed and the length of the pencil become smaller?

4. Why does this happen? What does this mean?

Keywords: Qingdao edition fourth grade science PPT courseware free download, Navigator’s Discovery PPT download, .PPT format;

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"Navigator's Discovery" PPT courseware:

"The Discovery of the Navigator" PPT courseware Part One: The theory of a round sky and a square earth The ancient Chinese believed that the sky was like a pot, semicircular; the earth was like a square chessboard, flat. Hun Tian said that the sky is like an egg, the earth is like an egg yolk, the sky is big and the earth is small, but there is still water in the sky, including...

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Update Time: 2024-11-02

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"The Discovery of the Navigator" PPT