a naturally occurring inorganic compound ("non-living material") possessing fairly definite physical properties and chemical composition
extensive mineral bodies composed of one or more minerals in varying proportions which form part of the earth's crust
Sediment can travel in water (ocean currents or rivers). Eventually, the sediment forms layers as it is deposited and buried. Over a long, long period of time these layers of sediment are "cemented" together to form new rocks known as sedimentary rocks!
only appear at the earth's surface AFTER the rocks above them have eroded
a volcano is an extrusive igneous formation