Photos of Iowa Meteorites   Historic accounts of meteorites striking Iowa make fascinating reading.  They are but the latest of numerous asteroids that have bombarded the Earth throughout its history.   This same process caused the impressive Manson Impact Structure in Pocahontas County.   Amana: This 74-pound fragment was part of a dazzling fireball that fell near Homestead, in Iowa County, the wintery evening of February 12, 1875. On loan from Amana Heritage Museum.     Estherville: A monument in Emmet County commemorates the exploding fall of a meteorite on May 10, 1879.  This is one of three large fragments recovered. On loan from Cornell College.     Marion: Iowa’s first recorded meteorite arrived with a loud blast heard throughout Johnson and Linn counties on February 25, 1847, the day the Legislature (then in Iowa City) established The Universityof Iowa. On loan from The University of Iowa.     Mapleton: A slice sawed from a 108-pound iron meteorite found in June 1939, by a Monona County farmer shows the fine edges of large iron crystals. On loan from Field Museum of Natural History.     Forest City: Rock fragments from this exploding meteor showered an eight-square mile area of Winnebago County on May 2, 1890. On loan from Cornell College.     Lone Tree: This slab was sawed from a 46-pound stony meteorite discovered during cultivation in Johnson County in May 1972. Geological Survey Bureau.   Photo setups by Patricia J. Lohmann Photos by Paul VanDorpe   Adapted from Iowa Geology 1999, Iowa Department of Natural Resources