Presentation on theme: "Energy in the Geosphere"— Presentation transcript:
1Energy in the Geosphere Learning Goals:Understand that there are 3 plate boundaries and that specific geological events occur at each boundary.Understand that the movement of plates occurs as a result of energy in the core of the Earth. (Nuclear: Radioactive Decay)Understand that changes in density result from temperature inputs.Understand that changes in density create convection currents.
2A little Review Basic Definitions The Formula Mass: Volume: Density: the amount of matter in an objectVolume:the amount of space an object occupiesDensity:the ratio between the mass of the object and the amount of space that the object occupiesThe FormulaDensity=mass/volume
3Density Calculations Example #1 D=m/v Calculate the density of a 23g rock with a volume of 3.2cm3.D=m/vD=23/3.2D=7.19g/cm3
4Density Calculations Example #2 The solid inner core of the Earth has a density of approximately 13g/cm3. Calculate the mass of 5cm3 of this substance.D=m/v13=m/513*5=m65g=m
5Transforming Boundary Understand that there are 3 plate boundaries and that specific geological events occur at each boundary.Transforming BoundaryDefinition:Two plates sliding next to each other in opposite directions.Geologic FeatureStrike-Slip Fault LineDiverging BoundaryTwo plates moving away from each other.Oceanic Ridge/Location where “new” surface rock appearsConverging BoundaryTwo plates sliding toward each other.Oceanic Trench/Mountain Building/Volcanic Activity
6The Composition of the Earth Understand that the movement of plates occurs as a result of energy in the core of the Earth. (Nuclear: Radioactive Decay)The Composition of the Earth
7Lower Mantle: Liquid; convection currents Understand that the movement of plates occurs as a result of energy in the core of the Earth. (Nuclear: Radioactive Decay)The Inner Core: Solid Iron; b/c as radioactive elements decay they keep releasing energy until they become stable.The Outer Core: Liquid Iron; b/c as radioactive elements decay they release energy (Thermal)Lower Mantle: Liquid; convection currentsUpper Mantle: (Asthenosphere) Solid-ish; as the distance from the core increases, materials begin to solidify.Crust (Lithosphere) Solid; this is where the plates are located
8Understand that changes in density result from energy inputs. An increase in temperature is an energy input or energy transfer!As temperature ↑, volume ↑;As temperature ↑, mass↔;As temperature ↑, density ↓.As the density of an object ↓,the object will go ↑.
9Understand that changes in density create convection currents. The material moves away from the heat source and cools.The cooled material becomes more dense and falls.The heated material becomes less dense and rises.Material near the core is heated by radioactive decay.