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Geology Of Iowa
The geography of Iowa includes the study of bedrock, landforms, rivers, geology, paleontology and urbanisation of the U.S. state of Iowa. The state covers an area of 56,272.81 sq mi (145,746 km2). Bedrock features Iowa's bedrock geology generally increases in age from west to east. In northwest Iowa Cretaceous bedrock is ca. 74 million years old; in eastern Iowa Cambrian bedrock dates to ca. 500 million years ago. Meteor impact structures Manson impact structure Seventy-four million years ago, a large asteroid crashed into what is now southeast Pocahontas county creating the Manson crater. Nearly 22 miles in diameter, it would have killed most animals within 650 miles, roughly an area from modern Denver to Detroit. This was originally thought to have been one of the causes of the dinosaur extinction, but recalculation of the impact's age indicates it occurred some 12 million years before the mass extinction. Although glaciation has erased all surface evidence of the im ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician Meteor Event
The Ordovician meteor event was a dramatic increase in the rate at which L chondrite meteorites fell to Earth during the Middle Ordovician period, about 467.5±0.28 million years ago, lasting for about 40 million years. This rate increase is indicated by abundant fossil L chondrite meteorites in a quarry in Sweden and enhanced concentrations of ordinary chondritic chromite grains in sedimentary rocks from this time. According to a 2019 study, this temporary increase in the impact rate could have been caused by the destruction of the L chondrite parent body that was in diameter and orbited in the asteroid belt between Mars and Jupiter. This occurred around 468 ± 0.3 million years ago having scattered fragments into Earth-crossing orbits, a chronology which is also supported by shock ages in numerous L chondrite meteorites that fall to Earth today. It has been speculated that this influx contributed to, or possibly even instigated, the Great Ordovician Biodiversification Even ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other Chemical element, elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a type of fossil fuel, formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian (geology), Pennsylvanian) and Permian times. Coal is used primarily as a fuel. While coal has been known and used for thousands of years, its usage was limited until the Industrial Revolution. With the invention of the steam engine, coal consumption increased. In 2020, coal supplied about a quarter of the world's primary energy and over a third of its Electricity generation, electricity. Some iron and steel-maki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iowa Coal Mine
Iowa ( ) is a state in the upper Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Illinois to the east and southeast, Missouri to the south, Nebraska to the west, South Dakota to the northwest, and Minnesota to the north. Iowa is the List of U.S. states and territories by area, 26th largest in total area and the List of U.S. states and territories by population, 31st most populous of the List of states and territories of the United States, 50 U.S. states, with a population of 3.19 million. The state's List of capitals in the United States, capital, List of cities in Iowa, most populous city, and largest List of metropolitan statistical areas, metropolitan area fully located within the state is Des Moines, Iowa, Des Moines. A portion of the larger Omaha–Council Bluffs metropolitan area, Omaha, Nebraska, metropolitan area extends into three counties of southwe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sioux City
Sioux City () is a city in Woodbury and Plymouth counties in the U.S. state of Iowa. The population was 85,797 in the 2020 census, making it the fourth-most populous city in Iowa. The county seat of Woodbury County, Sioux City is the primary city of the five-county Sioux City metropolitan area, which had 149,940 residents in 2020. Sioux City and the surrounding areas of northwestern Iowa, northeastern Nebraska and southeastern South Dakota are sometimes referred to collectively as Siouxland. Sioux City is located at the navigational head of the Missouri River. The city is home to several cultural points of interest including the Sioux City Public Museum, Sioux City Art Center and Sergeant Floyd Monument, which is a National Historic Landmark. The city is also home to Chris Larsen Park, commonly referred to as "the Riverfront", which includes the Anderson Dance Pavilion, Sergeant Floyd River Museum & Welcome Center and Lewis and Clark Interpretive Center. History Iow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fremont County, Iowa
Fremont County is a county located in the U.S. state of Iowa. As of the 2020 census the population was 6,605, making it the state's seventh-least populous county. The county seat is Sidney. The county was formed in 1847 and named for the military officer John C. Frémont. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.1%) is water. Major highways * Interstate 29 * U.S. Highway 59 * U.S. Highway 275 * Iowa Highway 2 * Iowa Highway 333 Adjacent counties * Mills County (north) * Page County (east) * Atchison County, Missouri (south) * Otoe County, Nebraska (southwest) * Cass County, Nebraska (northwest) History Fremont County was impacted by the 2019 Midwestern U.S. floods. Buyouts are under discussion for residents in Hamburg and McPaul. On April 17, 2025, several homes and businesses Fremont County were damaged by an intense hailstorm. The hail was caused by a larger storm system that spawned ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake
An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. In its most general sense, the word ''earthquake'' is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear weapons testing. The initial point of rupture is called the hypocenter or focus, while the ground level directly above it is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lineville, Iowa
Lineville is a city in Wayne County, Iowa, Wayne County, Iowa, United States. The population was 195 at the time of the 2020 United States census, 2020 census. Geography According to the United States Census Bureau, the city has a total area of , all land. History Lineville has been called the oldest town in Wayne County, Iowa, Wayne County, but was not noted on early maps or in the 1850 state line survey, and probably attracted settlers from a nearby short-lived community called Grand River after the state line dispute was settled. Lineville was platted in 1858. Because part of the town is in Missouri and part in Iowa, it was named Lineville. The town square sits on the Iowa–Missouri border with the business on the south side of the square in South Lineville, Missouri. When Wayne County was Dry county, dry, liquor by the drink could be purchased at the bars on the Missouri side of the square. During the 1968 Illinois earthquake, the quake was felt as a long shaking in Line ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
