Presentation on theme: "Earth Systems 3209 Unit: 1 Introduction to Earth Science – The Evolution of Planet Earth Reference: Chapters 1, 17 and Appendix A & B."— Presentation transcript:
1 Earth Systems 3209Unit: 1Introduction to Earth Science – The Evolution of Planet EarthReference:Chapters 1, 17 and Appendix A & B
2 Earth’s Interior Focus on . . . Unit 1: Topic 2.4 recognizing that Earth (Geosphere) has a layered Interior.identifying the characteristics of each layer.drawing a diagram representing Earth's interior.
3 Earth’s InteriorThe model of Earth’s interior is based on indirect evidence.The diagram to the left outlines four main layers inside of Earth.Text Reference: pages &
4 Layers of Earth’s Interior LithosphereLithospherecool, rigid layer directly above the asthenosphereapproximately 100 km thick, which includes the entire crust and a portion of the uppermost mantle
5 Layers of Earth’s Interior CrustCrust (two types)Continental Crust – 30 to 40 km thick and has low densityOceanic Crust – approximately 5 km thick and has high density
6 Layers of Earth’s Interior MOHOMohorovicic Discontinuity (Moho)boundary separating the crust and the mantledistinguished by an increase in rock densityvelocity of seismic waves show an increase
7 Layers of Earth’s Interior AsthenosphereAsthenosphere (Upper Mantle)hot, weak zone of rock that is capable of gradual movement. This is the layer that the crustal plates rest uponlocated from approximately 100 km to 700 km in depth
8 Layers of Earth’s Interior Lower MantleLower Mantleconsist of high density rocks rich in compounds of iron, magnesium, and siliconthis layer is approximately 2200 km thick
9 Layers of Earth’s Interior Outer CoreOuter Coreconsist of liquid iron and nickelapproximately 2270 km thickseismic waves (S-waves) do not pass through this layer
10 Layers of Earth’s Interior Inner CoreInner Coreconsist of solid iron and nickelapproximately 1216 km thick
11 Temperature and Density Increases with Depth Temperature inside Earth increases at a rate of approx. 35 degrees Celsius per kilometer.This is referred to as the Geothermal Gradient.Density inside Earth also increases as depth inside of Earth increases.
12 Example 1: Which layer of Earth’s structure is represented by “X” asthenosphereinner corelithosphereOuter core
13 Example 2: Which best describes continental crust? 7 kilometres thick; higher density than ocean crust7 kilometres thick; lower density than ocean crust35-40 kilometres thick; higher density than ocean crust35-40 kilometres thick; lower density than ocean crust
14 Example 3:Which is the correct sequence of Earth’s layers from the surface to the center? Surface Center (A) crust - inner core - outer core – mantle(B) crust - mantle - outer core - inner core(C) mantle - crust - inner core - outer core(D) mantle - outer core - inner core - crust
15 Your Turn . . .Take the time and complete the following questions (Solutions to follow)Questions:Draw a well labeled diagram outlining the layers of Earth.
16 Solutions . . .Labelled Diagram of Earth’s Layers:
17 Your Turn . . .Take the time and complete the following questions (Solutions to follow)Questions:Reference the next slide and answer the questions on the bottom of the slide.
18 Your Turn . . . Q. 1 Label each of the layers in the diagram above. DensityRelative TemperatureQ. 1 Label each of the layers in the diagram above.Q. 2 Fill in the relative temperature as “HIGH” or “LOW”.Q. 3 Fill in the density as “HIGH” or “LOW”.