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| Description: Naming igneous rocks Other compositional groups Andesitic (or intermediate) Ultramafic Form from sediment (weathered products) About 75 percent of all rock outcrops on the continents Used to reconstruct much of Earth’s history Clues to past environments Provide information about sediment transport Rocks often contain fossils Economic importance Coal Petroleum and natural gas Sources of iron and aluminum Classifying sedimentary rocks Two groups based on the source of the material Detrital Chemical Detrital rocks Material is solid particles Classified by particle size Common rocks include Shale (most abundant) Sandstone Conglomerate Picture Stats: Views: 246 Filesize: 135.13kB Height: 954 Width: 770 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39384 |