logging in or signing up imp cra Reaa Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 288 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 16, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Impact Craters: Impact CratersWhat are craters?: What are craters? Craters are bowl-shaped ground depressions created by: 1) volcanic eruptions, 2) bomb explosions, or 3) falling debris from space (impactors). Candidates for impactors are asteroids, comets, and meteoroids.Impactors: Impactors Asteroids: rocky leftover planetesimals of the inner solar system consisting of rocky and metallic substances. Ida and its satellite, DactylImpactors: Impactors Most asteroids originate from the asteroid belt located between Mars and Jupiter. Impactors: Impactors Comets: icy leftover planetesimals of the outer solar system. They are “dirty space snowballs” consisting of ice, gases, dust, and a rocky core. Comet HyakutakeImpactors: Impactors Short period comets come from the Kuiper Belt. Long period comets come from the Oort Cloud.Impactors: Impactors Meteoroid: small debris left from comets or asteroid collisions. Meteor: a meteoroid moving through the Earth’s atmosphere (a.k.a. a “shooting” or “falling” star). Meteorite: a meteoroid that has fallen to the Earth’s surface.Barringer Crater: Barringer Crater Approximately 1.2 km (0.75 mi.) wide and 200 m (650 ft.) deep. Created about 50,000 years ago by a 50 m (150 ft.) meteorite.Barringer Crater: Barringer Crater The impact gerated a blast of 20,000,000 tons of TNT upon impact.Chicxulub Crater: Chicxulub Crater Located off the coast of Mexico’s Yucatan Peninsula. At least 180 km (108 mi.) across and 45 km (27 mi.) deep.Chicxulub Crater: Chicxulub Crater Created 65 million years ago by a 10-km (6 mi.) impactor.Extra-terrestial Craters: Extra-terrestial Craters Our moon was probably created when a Mars-size object collide with the forming Earth billions of years ago. Callisto, a moon of Jupiter, is the most cratered body in our solar system. Impact frequency: Impact frequency Collisions: good or bad?: Collisions: good or bad? Good: early rain of rock and ice brought materials for the atmospheres, oceans, and polar caps to form. Could have also brought progenitors of life (amino acid compounds). Bad: any impact with a fairly large impactor today would be catastrophic. Thus… You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
imp cra Reaa Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 288 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 16, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Impact Craters: Impact CratersWhat are craters?: What are craters? Craters are bowl-shaped ground depressions created by: 1) volcanic eruptions, 2) bomb explosions, or 3) falling debris from space (impactors). Candidates for impactors are asteroids, comets, and meteoroids.Impactors: Impactors Asteroids: rocky leftover planetesimals of the inner solar system consisting of rocky and metallic substances. Ida and its satellite, DactylImpactors: Impactors Most asteroids originate from the asteroid belt located between Mars and Jupiter. Impactors: Impactors Comets: icy leftover planetesimals of the outer solar system. They are “dirty space snowballs” consisting of ice, gases, dust, and a rocky core. Comet HyakutakeImpactors: Impactors Short period comets come from the Kuiper Belt. Long period comets come from the Oort Cloud.Impactors: Impactors Meteoroid: small debris left from comets or asteroid collisions. Meteor: a meteoroid moving through the Earth’s atmosphere (a.k.a. a “shooting” or “falling” star). Meteorite: a meteoroid that has fallen to the Earth’s surface.Barringer Crater: Barringer Crater Approximately 1.2 km (0.75 mi.) wide and 200 m (650 ft.) deep. Created about 50,000 years ago by a 50 m (150 ft.) meteorite.Barringer Crater: Barringer Crater The impact gerated a blast of 20,000,000 tons of TNT upon impact.Chicxulub Crater: Chicxulub Crater Located off the coast of Mexico’s Yucatan Peninsula. At least 180 km (108 mi.) across and 45 km (27 mi.) deep.Chicxulub Crater: Chicxulub Crater Created 65 million years ago by a 10-km (6 mi.) impactor.Extra-terrestial Craters: Extra-terrestial Craters Our moon was probably created when a Mars-size object collide with the forming Earth billions of years ago. Callisto, a moon of Jupiter, is the most cratered body in our solar system. Impact frequency: Impact frequency Collisions: good or bad?: Collisions: good or bad? Good: early rain of rock and ice brought materials for the atmospheres, oceans, and polar caps to form. Could have also brought progenitors of life (amino acid compounds). Bad: any impact with a fairly large impactor today would be catastrophic. Thus…