Recognize a common noun when you see one. Nouns name people, places, and things. Every noun can further be classified as common or proper. A common noun names general items. Go into the kitchen.
A sandstone with at least 25 percent feldspar is called arkose. A sandstone made of volcanic particles is called tuff. The cement in sandstone is usually one of three materials: silica (chemically the same as quartz), calcium carbonate or iron oxide.
1 Clay is a sedimentary material made from bits of weathered rock that have combined with water. 2  Conglomerate rocks contain round river rocks surrounded by hardened sand or another type of sediment. 3  In swampy areas, plants die but they do not decay. 4  Instead, they turn into peat. The White Cliffs of Dover in England are made from the shells and remains of trillions of tiny animals that died more than 65 million years ago. 2  Clay is a sedimentary material made from bits of weathered rock that have combined with water.