1.

Fill in the Blanks1. The atmosphere is usually divided into …………….. layers. 2. The 99% of water is in the form of …………….. . 3. The third layer …………….. is the interior of the earth. 4. The topmost layer of the earth is …………….. . 5. Nicolaus copernicus is a …………….. astronomer. 6. Ptolemy is a …………….. astronomer.7. Georges Lemaitre is a ……………..

Answer»

1. 5

2. ice, saline water 

3. Core 

4. Crust 

5. Polish Astronomer 

6. Egyptian Astronomer 

7. Belgian



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