GEOG M107 Study Guide - Midterm Guide: Extrusive Rock, Distributary, Alluvial Fan
Document Summary
What did earth"s terrain originally consist of: 4. 543 billion years old, originally molten, then slowly solidified as earth cooled, oldest rocks on earth are approx. Any rock type can become any other type: what is a component of rocks that influences erodibility, type of bedrock, what are four important igneous rock types, extrusive (fine-grained) Fast cooling above ground, small crystals: intrusive (coarse-grained) From streams: may include organic matter, gray colors in saturated/anoxic conditions, lava flows: deposition/solidification of molten rock and other volcanic fragments, many events accruing ranges of depth. Basalt covers ocean basins because of spreading centers (and hotspots: uplift: slow, persistent movement from plate tectonics. Isostasy: equilibrium between earth"s crust and underlying mantle: uplift in some areas, downward movement in some. Climate changes, tectonics, volcanism: buried landscapes, uplift exposes older landscapes that react differently to modern processes, unconformity: a surface of contact between rocks that have different ages/histories.
