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7th gr science Dynamic Earth (pg. 101-104) Name: Made of weathered rock particles (sediments). Sediments: mud, sand, pebbles, shells, bones, leaves, stems, & remains of living things Over time, they are pressed and cemented together to make rocks. Clastic Rock Made from pieces of old rocks. Organic Rock Made from once living things. Grouped by size & shape of Ex: the pieces. Limestone: Ex: Made of calcite or calcium Conglomerate: carbonate. More than 1/3 of rock Usually organic, because made of pebbles. may be formed from Cemented by clay, mud, & shells of sea animals. sand. Chalk is soft limestone Pebbles are smooth & round, because they are Coal: weathered by water. Made from dead plants Also called puddingstone. Breccia – sharp/angular Sandstone: ½ of rock made of sand near water & cemented by minerals. More weathered than conglomerate, so more common. Shale: Made of clay & silt that settle to the bottom of quiet water (like swamps). Can have dead plants & animals in it. It can be split into flat pieces. Chemical Rock Made when a sea or lake dries and leaves minerals. Ex: Rock salt, Gypsum Limestone: Formed by minerals dripping in caves or chemical changes in the ocean. They are chemical not organic