Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only once.
1. Our solar system was created by the gravitational collapse of the ________.
2. Our Moon was most likely formed by a collision between Earth and a Mars-sized _____.
3. The first few hundred million years of the solar system's history were the time of the _____, during which Earth suffered many large impacts.
4. Mars was formed by the ____ of smaller objects.
5. The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar space by the _____.
6. Ice can form from a gas through the process of _____.
7. Hydrogen compounds in the solar system can condense into ices only beyond the _______.
8. _______ allows us to determine the age of a solid rock.
Answer:
1. solar nebula
2. planetesimal
3. heavy bombardment
4. accretion
5. solar wind
6. condensation
7. frost line
8. Radiometric dating
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