ASTRON 10 Lecture 18: Erosion and Soils, Highlands and Lowlands, Tectonics
Document Summary
Melting and freezing of water breaks up rocks. Particles in the air cool before reaching the ground again. Produces the rays/splatters of new impact hits around craters. Over time, the spheres get pits in them which reflect less light. The more pits --> not a perfect lens. Old impact hit craters do not have white rays. Particles stick to molten dust particles and disfigure the sphere. Sphere of glass used as a lens reflects light in the same direction it came from. Genesis rock - oldest rock in the solar system that is not from a meteorite. Moon"s highlands = white patches (old, many craters, granite) Moon"s lowlands = dark patches (young, lava covered) All of earth"s plates are moving; earth"s tectonics are very active. Frozen tectonics (tectonics that are no longer active) cooling crack (crack formed by cooling and shrinking or a planet) Venus: stress cracks (cracks from tugging back and forth of the land)
