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Chapter 1 Geology

What are the 3 zones of earth in order and thickness? Core (center) thick, mostly iron, liquid out, solid inner Mantel (middle) thick, dense silicates, a few molten spots Crust (surface) extremely thin consists of two types oceanic crust thin dense and continental crust thick less dense
Difference of lithosphere and asthensophere? Lithosphere is rigged, located at the crust and uppermost part of the mantle, its cold and dense it usually sinks down. Asthenosphere is plastic located below the lithosphere mid-upper mantle
Three types of plate boundaries Divergent. convergent, transform boundaries
Divergent boundaries typically initiates within a continent, two plates move apart from each other, a narrow valley is formed. fissures extend into a magma chamber. magma flows into the fissures may errupt. and when the magma cools, it becomes igneous rock. new crust
Convergent Boundarie plates move towards each other. Ocean Continent Convergence: creates volcanoes and when magma erupts into the surface it becomes extrusive rocks if it solifies in the crust it becomes intrusive rocks
Transform Boundaries Two plates slide horizontally past each other, creating earthquakes
what is subduction occurs in convergent plate boundaries. the thinner more dense goes under the thicker less dense, leads to mantel melting
Plate Tectonics revolutionzed study of geology. explains tons of seemingly unrelated geologic phenomea like where and why we have earthquakes, volcanoes, mountains, and mid oceanic ridges
internal heat engine hot material deep within the earth moves slowly upward toward the cool surface and cold denser material moves downward. all within the mantle
external heat engine driven by the sun and gravity. creates rain snow wind etc. creates sediment/broken rock
three types of rocks sedimentary rocks. igneous rocks, metamorphic rocks
how are sedimentary rocks formed? weathering, erosion, or deposition from weather
how are igneous rock formed? melting + cooling
how are metamophic rocks formed? heat + pressure
7 continents? north america, south america, antartica, africa, Europe, australia, asia
Created by: sanchezdaniel