AST101H1 Lecture Notes - Lecture 13: Meteor Crater, Himalayas, Basalt

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Michael Reid

Document Summary

Earth: oceans and land, geologically active : processes that change the surface of a planet over time, interior continual radioactivity decay, core (metal): highest density and presence of nickel and iron, mantle : medium density and presence of silicon, oxygen, etc. due to, crust : lowest density and presence of granite, basalt, etc. The molten rock (magma) finds a path through from beneath the surface to erupt onto the surface: once it runs onto the surface, the magma is called lava, a process in which gases from the interior of the planet are released into the atmosphere is called outgassing, majority of the atmosphere of venus, earth and mars, along with the water vapours that created the earth"s oceans were a result of outgassing in active volcanoes, internal stresses in the crust that cause changes in a planet"s surface, convection of the mantle creates the internal stresses called.