meteorite

definition: 
A piece of rock or metal that has fallen to the earth’s surface from outer space as a meteor. Over 90 per cent of meteorites are of rock while the remainder consist wholly or partly of iron and nickel.
sentence: 
They are very similar in composition to the carbonaceous chondrite meteorites that sometimes fall on Earth.
difficulty: 
easy
toefl frequency: 
2
toefl classification: