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Vocabulary Preview

A Choose the correct word for each definition.

explode survive billion planet Celsius
oxygen astronaut gravity meteor crater

1. planet : n. a very large round object in space that moves around the sun
2. gravity : n. the force of attraction to the center of the earth
3. explode : v. to burst with great force and loudly
4. billion : n. the amount of one thousand millions
5. Celsius : n. a temperature scale in which water freezes at 0° and boils 100°
6. oxygen : n. a gas that is necessary for most animals and plants to live
7. meteor : n. a piece of rock burning brightly when falling toward the earth
8. survive : v. to continue to live despite many problems
9. crater : n. a bowl-shaped place at the top of a volcano
10. astronaut : n. a person who travels and works in a spacecraft

B Match each of the vocabulary words with the correct synonym.

Vocabulary Word Synonym

1. create • • a. blast, crack, smash

2. swallow • • b. center, essence, focus

3. occur • • c. eat, drink, absorb

4. crash • • d. make, build, form

5. core • • e. happen, take place, arise

Unit 1 Space 109