Chapter Two Geology
Geo. 101 Ch1. Homogeneous Accretion Theory for the formation of the differentiated earth
1.Early Earth- uniform composition&density(mostly silicates) 2. Earth heated up to melt Iron&Nickel to create a core. Heated by meteorite impact, gravitational compression, &radioactive decay the iron/nickel weigh more than silicates so settled to earth’s center. 3. Earth was formed consisting of a dense iron-nickel core; an iron-rich silicate mantle and a silicate crust with continents emission of gases the formation of oceans and the atmosphere.
Why earth is a dynamic (continuously changing) and evolving planet
Core: Interior part of earth (2parts)INNER CORE small solid&OUTER CORE larger liquid-made of iron& nickel.
Mantle: The thick layer between earth’s crust and core.Made of igneous rock(iron/magnesium)
Has 3 zones 1.Lower:solid 2.Asthenosphere:The part of the mantle that lies below the lithosphere; it behaves plastically&flows slowly. Partial melting creates magma which rises less dense 3.Upper:Surrounds the Asthenosphere and is solid. The mantle take up83% of earths volume.
Lithosphere:Earth’s outer, rigid part, consisting of the upper mantle, oceanic crust, & continental crust.
Plates: The lithosphere broken up into individual pieces. They move over the mantles Asthenosphere.
Movement of Earth’s Plates:The plates move due to the mantles CONVECTION CELLS: warm material rises toward surface, cools&descends back into the interior. Creating volcanoes, earthquakes, MTNS.
Crust: Earth’s outer most layer 2typesContintinential: thick w/silicon,aluminum-Oceanic crust:Thin denser w/ dark igneous rocks (basalt/gabbro)
PLATE TECHTONIC THEORY:The lithosphere that is broken into plates move on earth’s surface relative to one another. Zones of volcanic, E.quake mark most plate boundaries.
The Rock Cycle: Earths materials pass as they are transformed from one major rock type to another. Rock: An aggregate of Minerals: which are naturally occurring inorganic,
1.Early Earth- uniform composition&density(mostly silicates) 2. Earth heated up to melt Iron&Nickel to create a core. Heated by meteorite impact, gravitational compression, &radioactive decay the iron/nickel weigh more than silicates so settled to earth’s center. 3. Earth was formed consisting of a dense iron-nickel core; an iron-rich silicate mantle and a silicate crust with continents emission of gases the formation of oceans and the atmosphere.
Why earth is a dynamic (continuously changing) and evolving planet
Core: Interior part of earth (2parts)INNER CORE small solid&OUTER CORE larger liquid-made of iron& nickel.
Mantle: The thick layer between earth’s crust and core.Made of igneous rock(iron/magnesium)
Has 3 zones 1.Lower:solid 2.Asthenosphere:The part of the mantle that lies below the lithosphere; it behaves plastically&flows slowly. Partial melting creates magma which rises less dense 3.Upper:Surrounds the Asthenosphere and is solid. The mantle take up83% of earths volume.
Lithosphere:Earth’s outer, rigid part, consisting of the upper mantle, oceanic crust, & continental crust.
Plates: The lithosphere broken up into individual pieces. They move over the mantles Asthenosphere.
Movement of Earth’s Plates:The plates move due to the mantles CONVECTION CELLS: warm material rises toward surface, cools&descends back into the interior. Creating volcanoes, earthquakes, MTNS.
Crust: Earth’s outer most layer 2typesContintinential: thick w/silicon,aluminum-Oceanic crust:Thin denser w/ dark igneous rocks (basalt/gabbro)
PLATE TECHTONIC THEORY:The lithosphere that is broken into plates move on earth’s surface relative to one another. Zones of volcanic, E.quake mark most plate boundaries.
The Rock Cycle: Earths materials pass as they are transformed from one major rock type to another. Rock: An aggregate of Minerals: which are naturally occurring inorganic,