GEOL 1001 : Exam One (Ch. 1 & 2)
Document Summary
The atmosphere is mostly: 78% nitrogen (n2, 21 % oxygen (o2, minor amounts (1%) of other gases. Weather is limited to this layer: tropopause (11 12 km), stratosphere (12 47 km), mesosphere (47 81 km), thermosphere (> 81 km), boundaries between layers are termed pauses. Earth: land (continents and islands) form about 30% of the surface, surface water covers the remaining 70% of the earth"s surface. Elemental composition of earth: 90% percent of earth is comprised of 4 elements. Magnesium (mg) 10: the remaining elements form 10% of earth, glasses noncrystalline mineral-like matter, rocks aggregates of minerals. Metamorphic rock altered by pressure and temperature: sediments accumulations of loose mineral grains, metals solids made of metallic elements, melts rocks that have been heated to a liquid. Lava molten rock at the surface: volatiles materials that turn into gas at the surface.
