Lesson-3-Subsystems-of-Earth-deeper lesson
- 1. LAYERS OF EARTH Earth and Life Science
- 2. LAYERS OF EARTH • Crust • Mantle • Outer core • Inner core
- 3. Crust is the thinnest and outermost layer of the Earth which is inhabited by almost all forms of life. Earth’s crust is classified into two: Oceanic crust – thinner and extends to only 5-8miles under the ocean ; composed primarily of basalt. Continental crust – extends 25 miles thick under the continents; composed primarily of granite. • Crust • Mantle • Outer core • Inner core
- 4. The crust is also divided into continental plates. The theory of Plate Tectonics states that Earthquakes, volcanoes, mountain building, and the movement of continents are the result of the movement of lithospheric plates. • Crust • Mantle • Outer core • Inner core
- 5. This term was introduced by Alfred Wegener and means “all of Earth”; one huge landmass; supercontinent . RECITATION P_ _ _ _ _ _ A N G A E A
- 6. Pangaea later moved away from each other giving rise to the present 7 continents we have. • Crust • Mantle • Outer core • Inner core 1. Asia 2. North America 3. Europe 4. South America 5. Africa 6. Australia 7. Antarctica
- 7. It is the second layer of the Earth and is the thickest, too. It is composed of two layers known as upper and lower mantle. The upper mantle together with the crust is called lithosphere. Between the upper and lower mantle is the asthenosphere which has an asphalt like consistency and is caused of the movement of the tectonic plates. • Crust • Mantle • Outer core • Inner core
- 8. The heat difference between the upper and lower mantle creates convection – a circular movement of heat transfer from the lower mantle to the less hot upper mantle; causing the hot rock materials rising up and the denser rock materials sinking to the bottom (rock cycle). • Crust • Mantle • Outer core • Inner core
- 9. It is basically liquid and extends 2900km thick, composed of iron and nickel. Due to a very high temperature of 4000 to 9000⁰F that is hotter than the surface of the Sun, it makes the form of outer core liquid. The movement in the outer core gives the Earth its magnetic field. • Crust • Mantle • Outer core • Inner core
- 10. The last and innermost layer of the Earth, composed of iron and nickel but in solid form. • Crust • Mantle • Outer core • Inner core
Editor's Notes
- #2: The Earth
- #4: The layers of the Earth are not static but are in constant motion resulting in the movements of tectonic plates.
- #5: North America, Africa, south America and Europe they are exist in single continent called Pangaea ALL the EARTH This 4 continent torn apart because of rifting began as magma welled up through the weakness in the crust, creating a VOLCANIC RIFT ZONE
- #6: The layers of the Earth are not static but are in constant motion resulting in the movements of tectonic plates.