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PLATE TECHTONICS TEXT CH. 3..PG. 80. How do geologists study inside earth? Look at rock samples – Can determine conditions deep in the earth by looking.

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Presentation on theme: "PLATE TECHTONICS TEXT CH. 3..PG. 80. How do geologists study inside earth? Look at rock samples – Can determine conditions deep in the earth by looking."— Presentation transcript:

1 PLATE TECHTONICS TEXT CH. 3..PG. 80

2 How do geologists study inside earth? Look at rock samples – Can determine conditions deep in the earth by looking at rocks formed there – Get rocks by drilling and blasting Seismic waves: Waves produced by earthquakes – Speed & Path of the waves are used to look at structure

3 Earth’s Interior 3 layers: Crust, Mantle, Core Vary in size, composition, temperature, and pressure Temperature increases as you go deeper Pressure (force pushing on an area) increases as you go deeper Why do you think these things increase?

4 Crust Outermost layer of the earth Solid rock, dry land, ocean floor Very thin…5-40 km thick Thickest crust is under mountains (up to 70 km)…. Thinnest under ocean floor (oceanic crust) Oceanic Crust made of basalt Continental crust mainly granite

5 Mantle Approximately 40 km beneath the surface of earth Solid, hot layer of rock Divided into 3 layers: – Lithosphere – Astenosphere – Lower Mantle

6 Lithosphere Uppermost Mantle & lower part of the crust Rigid layer Approximately 100 km thick

7 Asthenosphere Hotter and more pressure Less rigid—more soft like plastic or plahdoh Bendable Thickest part of the mantle “Asthenes” means “Weak” in Latin

8 Lower Mantle Solid Extends to earth’s core

9 Core Made mostly of iron and nickle 2 parts: Liquid outer & Solid Inner 3,486 km thick Tons of pressure here…inner core has so much pressure, it has to stay solid Creates magnetic field of the earth---Acts as a bar magnet

10 Heat Transfer in the Mantle Section 2…pg. 88

11 Radiation Heat transfer through Space No direct Contact Travels in waves….no particles Examples: Sunlight, Fire

12 Conduction Heat transfer by direct contact (touching it) Example: Spoon in soup, Touching a hot stove Particles in the bottom get hot…move faster…bump into particles further up, and so on…

13 Convection Heat transferred using current action Liquids & Gases Heat “flows” From one area to antoher Happens because of differences in density and pressure………heat “flows” from high to low

14 Convection Currents Currents caused by the movement of particles in convection Flow of heat transfer Stops when heat source stops Examples: Weather, Ocean Currents

15 Earth’s Convection Currents Liquid in the core transfers heat through convection Mantle “flows” very slowly causing the rock to cycle up and down

16 Work: Complete pg. 91 #2b & 3c ----on your notes WB pg


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