NATS 1740 Lecture Notes - Lecture 25: Meteor Crater, Impact Crater, Lunar Mare

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Michael De Robertis, Alireza Rafiee

Document Summary

+magnets stick together => the same force of electricity. +moving charged particles create magnetic fields => created by earth"s interior if its core conducting, convecting and roatating electricity. + p waves (pressure) push matter back and forth => go through earth"s core. + s waves shake matter side to side => no going through. => 2 waves are generated at any earthquakes. => earth"s core must have a liquid outer layer. We get hit by big asteroids or comets => impact cratering. Volcanism: eruption of molten rock onto surface. Tectonics: disruption of a planet"s surface by internal forces. Erosion: wind, water, ice change surfaces: impact cratering. Happens 10-100 million of years => if it happens it"s really big. Craters are 10-15 times to the original object that hit the surface. Crater density can be used to age-date the planet surface.