31. An "'impact event "'is a collision between astronomical objects causing measurable effects. 32. An impact event may cause a mantle plume ( volcanism ) at the antipodal point of the impact. 33. This type of system uses events such as earthquakes, impact events or nuclear explosions as wave sources. 34. It has been hypothesized that the Gulf experienced a major asteroid impact event in 536 A . D. 35. Its fossils, typical of shallow marine environments, show it to be a marine target impact event . 36. The interior floor has been scored by the impact event that created the Mare Orientale to the southeast. 37. This combination led these researchers to speculate that it may be the result of a large impact event . 38. On Europa, impact events and subsequent penetration into a ductile or liquid crust were suggested in 2004. 39. Instruments are available for making measurements related to the flight of the projectile and the target impact event . 40. The impact event , equivalent to Slate Islands crater in Lake Superior, and Ames crater in Oklahoma.
