Match the words to the appropriate blanks in the sentences. Use each word only once.
condensation,planetesimal, accretion, frost line,solar nebula, heavy bombardment, solar wind, radiometric dating
The first few hundred million years of the solar system 19s history were the time of the __________, during which Earth suffered many large impacts.
The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar space by the _________________
Ice can form from a gas through the process of ______________.
Hydrogen compounds in the solar system can condense into ices only beyond the ______________.
Our Moon was most likely formed by a collision between Earth and a Mars-sized ___________________
Mars was formed by the ________________of smaller objects
Our solar system was created by the gravitational collapse of the ________________

__________________ allows us to determine the age of a solid rock.