Structure Latitude Longitude Hicks Dome 37.5 -88.3 Avon 37.8 -90.2 Crooked Creek 37.8 -91.4 Decaturville 37.9 -92.7 Hazelgreen 37.7 -92.4 Weaubleau-Osceola 38.0 -93.6 Rose Dome 37.7 -95.7

The 38th parallel structures are a series of circular depressions or deformations stretching 700 km (435 mi) across southern Illinois and Missouri into eastern Kansas at a latitude of roughly 38 degrees north. Rampino and Volk (1996) postulated that these could be the remains of a serial meteorite strike in the late Mississippian or early Pennsylvanian periods. Difficulty in determining the age of many of the structures and doubts about the exogenic origins of several of them leave some geologists skeptical of this hypothesis.There is evidence that Hicks Dome is volcanic in origin(There are small igneous dikes radiating from it and there are several minor faults in the area),this is also true for the other structures as well. Image File history File links 38th_parallel_structures. ... Categories: Geology stubs | Craters of the United States | Impact events | Missouri geography ... Categories: Geology stubs | Craters of the United States | Impact events | Missouri geography ... The 19 km-diameter (12 mi) circular Weaubleau-Osceola structure is discernable in the drainage patterns of this shaded-relief image. ... Official language(s) English Capital Springfield Largest city Chicago Area  Ranked 25th  - Total 57,918 sq. ... Official language(s) none, English most common Capital Largest city Jefferson City Kansas City Area  - Total   - Width   - Length    - % water  - Latitude  - Longitude Ranked 21st 69,709 sq mi  180,693 km² 240 miles  385 km 300 miles  480 km 1. ... Official language(s) English Capital Topeka Largest city Wichita Area  Ranked 15th  - Total 82,277 sq. ... Latitude, usually denoted symbolically by the Greek letter φ, gives the location of a place on Earth north or south of the Equator. ... This article is about the geologic period; for the North American culture, see Mississippian culture. ... The Pennsylvanian is a geologic (sub)period lasting from roughly 325 million years before the present (BP) to 286 million years BP. As with most other geologic periods, the rock beds that define the period are well identified, but the exact date of the start and end are uncertain by... Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history and the processes that shape it. ...

Interest in the possibility of serial impacts on Earth was piqued by observations of comet Shoemaker-Levy 9 impacting on Jupiter in 1994. It is estimated, however, that the likelihood of such an event on Earth is vanishingly small because the Earth's weaker gravitational field is much less able than Jupiter's to pull a speeding object close enough to be torn apart by tidal forces. However, evidence of past serial impacts on the Moon can be seen in several chains of craters. Earth (often referred to as The Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size. ... Hubble Space Telescope image of Comet Shoemaker-Levy 9, taken on May 17, 1994. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... 1994 (MCMXCIV) was a common year starting on Saturday of the Gregorian calendar, and was designated like the International Year of the Family and the International Year of the Sport and the Olympic Ideal. // Events January Bill Clinton January 1 : North American Free Trade Agreement (NAFTA) goes into effect. ... Bulk composition of the moons mantle and crust estimated, weight percent Oxygen 42. ... The Moons surface is covered in many interesting geologic features. ...

See also

• Impact event
• Roche limit

To meet Wikipedias quality standards, this article or section may require cleanup. ... The Roche limit is the distance within which a celestial body held together only by its own gravity will disintegrate due to a second celestial bodys tidal forces exceeding the first bodys gravitational self-attraction. ...

References