VOA慢速英语:California Study Finds Moon is 4.51 Billion Years Old

impact – n. the act or force of one thing hitting another

acquire – v. to get something

plate tectonics – n. the geology theory that Earth’s surface is made of very large sections or plates that move very slowly

generate – v. to produce something or cause something to be produced

solar system – n. a group of planets and objects that orbit around a star

assumption – n. something that is believed to be true or probably true but that is not known to be true : something that is assumed

meteorite – n. a piece of rock or metal that has fallen to the ground from outer space

probe – n. a long thin scientific object used to measure or get information

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