The history of water on Mars is a crucial question for our understanding of the geologic history of the planet. Arabia Terra is a region that can help us address this question. This region is located on the lowland-highland dichotomy boundary and contains the largest expanse of heavily cratered terrain in the Martian northern hemisphere. The northern plains are proposed to be the location of ancient oceans, and evidence of this may lie in the morphology of the craters located along the edge of Arabia Terra. Because of its location, Arabia Terra provides us with a window into the extent of the role volatiles have played in shaping the Martian surface. This uniqueness of Arabia Terra has prompted previous studies but all have been limited in their spatial extent and/or features studied. Our study will provide a complete look at the extent to which volatiles have influenced the impact crater record in the Arabia Terra region.
Themes in the study of impact cratering Crater morphology Stress waves in solids Cratering mechanics: contact and compression stage Ejecta deposits Scaling of crater dimensions Cratering mechanics: modification stage Multiring basins Cratered landscapes Atmospheric interactions Impact cratering and planetary evolution Appendix I: Derivation of the Hugoniot equations Appendix II: Equations of the state for impact cratering General bibliography Index.
Blunt trauma abdomen rarely leads to gastrointestinal injury in children and isolated gastric rupture is even rarer presentation. We are reporting a case of isolated gastric rupture after fall from height in a three year old male child.