Videos A to Z

• Plant Structure and Function: Leaf Cross Section - Mesophyll

  
  • 3-5
  • 6-8
  • 9-12

  The mesophyll, located below the epidermis, is made of two layers - the palisade layer, made of cells instrumental in carrying out photosynthesis; and the spongy layer, which has many air cavities, in…  » more info

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    • PBS Utah
    • UEN-TV
    • EMEDIA

• Plant Structure and Function: Leaf Cross Section - Stomata

  
  • 3-5
  • 6-8
  • 9-12

  Stomata are small holes that allow gases to flow in and out of the leaf.  » more info

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• Plant Structure and Function: Plant Diagram

  
  • 3-5
  • 6-8
  • 9-12

  Plants possess vascular tissue, which is a system of tiny tubes that move food and water throughout the plant.  » more info

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• Plant Structure and Function: Root tip video clip

  
  • 3-5
  • 6-8
  • 9-12

  Roots lengthen at the root tip.  » more info

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• Plate Tectonics: Convergent boundary

  
  • 3-5
  • 6-8
  • 9-12

  The place where two plates collide is called a convergent boundary.  » more info

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• Plate Tectonics: Directions plates move

  
  • 3-5
  • 6-8
  • 9-12

  This map of lithospheric crust indicates the directions in which plates are moving.  » more info

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• Plate Tectonics: Divergent boundary

  
  • 3-5
  • 6-8
  • 9-12

  Divergent boundaries form when two plates separate.  » more info

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• Plate Tectonics: Iceland

  
  • 3-5
  • 6-8
  • 9-12

  Iceland straddles the Mid-Atlantic Ridge where the North American Plate and Eurasian Plate are moving away from one another.  » more info

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• Plate Tectonics in Action: Continental drift fossils

  
  • 3-5

  Alfred Wegner and other scientists found similar fossils of the same age on widely separate continents, suggesting they were once connected.  » more info

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• Plate Tectonics in Action: Jigsaw continents

  
  • 3-5

  Scientists noticed that the shape of the continents make them appear as if they could fit together, causing them to wonder if they were once connected.  » more info

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    • UEN-TV
    • EMEDIA