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meteorite – n. a piece of rock from outer space
sample – n. a small amount of something that represents what it is like
curator – n. a person who is in charge of a museum
time capsule – n. a container filled with objects considered to be typical of a period in history and buried, so that it can be dug up and studied much later
interact – v. to act upon one another
baby boom – n. a large increase in the number of babies born in a particular place during a particular time
grain – n. a very small piece of a hard substance
conclusion – n. a decision made after a lot of consideration
