0
Formation of the earth’s
surface
• Geosphere formed by accretion and
density stratification
• Surface stays molten for mil...
Wegener’s Continental Drift
Theory
• All continents were once joined together as a
supercontinent called Pangea
• Evidence...
Finding A Mechanism
• Wegener’s data was very well accepted but
without a mechanism the theory was abandoned
for decades
•...
Plate Tectonic Theory
• The crust is broken into pieces and is
moved by the movement of the
asthenosphere below it….
• Wha...
Properties of Materials
• First we must understand the properties of
materials
• http://www.youtube.com/watch?v=3qAs1Nt0Fj...
Is it a solid or a liquid?
• Exploration:
• Use these two substances and determine the properties
of each ….
• Silly putty...
Properties of Layers
• Crust – solid – conducts heat
• Upper Mantle – solid with liquid
properties – convects heat
• Lower...
Convection in Asthenosphere
• Heat from core changes
the density of the
material.
• As temp rises density
decreases and fl...
Fig. 1.7, p.7
Convection Videos
• https://www.youtube.com/watch?v=WEDU
tS0IMws
• https://www.youtube.com/watch?v=yt_K_b
fKxTc
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
HPU NCS2200 Plate Tectonics Lecture 1
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HPU NCS2200 Plate Tectonics Lecture 1

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HPU NCS2200 earth Science for elementary education majors plate tectonics lecture 1

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Transcript of "HPU NCS2200 Plate Tectonics Lecture 1"

  1. 1. Formation of the earth’s surface • Geosphere formed by accretion and density stratification • Surface stays molten for millions of years • Continents formed as crust cooled • Over time geologist have theorized what the continents looked like over the last 500 billion years….
  2. 2. Wegener’s Continental Drift Theory • All continents were once joined together as a supercontinent called Pangea • Evidence: – Similar shorelines – Fossils on opposite coasts match – Mountain ranges end on one continent and pick up on another – Same age rocks found on separate continents – Climate changes seen in the development of coal deposits – Glacial deposits found on South America and Africa • Problem? – No mechanism for the changes.
  3. 3. Finding A Mechanism • Wegener’s data was very well accepted but without a mechanism the theory was abandoned for decades • In the early part of the 20th century the development of sonar enabled scientists to see the terrain of the ocean floor • The discovery of the mid ocean ridge and the spreading of the sea floor helped to bring about the development of the currently accepted theory.
  4. 4. Plate Tectonic Theory • The crust is broken into pieces and is moved by the movement of the asthenosphere below it…. • What causes the asthenosphere to move?
  5. 5. Properties of Materials • First we must understand the properties of materials • http://www.youtube.com/watch?v=3qAs1Nt0Fjk – What is a solid? • Holds a shape • Molecules are tightly packed together – What is a liquid? • Takes the shape of its container • Molecules are more loosely collected and can move • Ability to flow from one container to another – What is a gas? • Expands to fill the container • Molecules are widely spaced • Can flow, expand and be compressed
  6. 6. Is it a solid or a liquid? • Exploration: • Use these two substances and determine the properties of each …. • Silly putty • Cornstarch (mix 3 Tablespoons of cornstarch with 1 T of water – the mixture should be very hard to stir but will flow out of a cup – if it gets too watery add a little more corn starch) • Go ahead and watch the podcast that I have on how this looks it will help! • Go ahead and do the exploration now…it will make the rest of the lecture make more sense – Besides its FUN!!!
  7. 7. Properties of Layers • Crust – solid – conducts heat • Upper Mantle – solid with liquid properties – convects heat • Lower Mantle – solid rock – conducts heat • Outer Core – liquid metal (less pressure than inner core allows metal to melt) – Liquid convects heat • Convection is the movement of heat as a flow of molecules • Inner Core – solid iron and nickel with strong nuclear fusion producing intense heat – Solid conducts heat • conduction is the movement of heat from molecule to molecule
  8. 8. Convection in Asthenosphere • Heat from core changes the density of the material. • As temp rises density decreases and fluid rises • As temp decreases, density rises and fluid sinks • This movement is called a convection current which moves the asthenosphere and thus the crustal plates attached to it.
  9. 9. Fig. 1.7, p.7
  10. 10. Convection Videos • https://www.youtube.com/watch?v=WEDU tS0IMws • https://www.youtube.com/watch?v=yt_K_b fKxTc
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