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Key Words

Sun Moon Earth planets star solar system orbit

atmosphere sphere poles Equator space rotation revolution

imaginary day night spin axis seasons satellite

constellation heavenly bodies

Let’s Exercise
Let ’ s Ex er cise

I. Fill in the blanks.

1. is the third planet from the sun.

2. The Earth rotates from West to .

3. of the Earth causes seasons.

4. The is huge ball of hot gases.

5. shine all day and night.

II. Give one word answers.

1. The blue planet –

2. A layer of air surrounding the Earth –

3. The fixed imaginary path –

4. The closest star to the Earth –

5. A heavenly body with its own light –

III. Answer the following questions in one or two sentences.

1. How many planets are there in the solar system? Name them.

2. Define rotation and revolution.

3. What causes day and night?

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