Users practicing this topic

Post date	Users	Rates	Content
2016-03-11	saramhl	80	Check this topic

Topic title: Practice7-Q6As geologists, one of our major areas of concern is rocks. The best way to define a rock is as matter composed of one or more naturally occurring substances. They can be anything from a tiny grain of one mineral to a massive compound made up o

Topic category: TOEFL speaking