Living with the physical environment-Section A-Tectonic Plates

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  • Created by: phoebe
  • Created on: 09-04-18 10:29
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  • Living with the physical environment-Section A-Tectonic Plates
    • THE EARTH'S STRUCTURE
      • CORE- ball of solid (inner) and liquid (outer) iron and nickel.
      • MANTLE- semi-molten rock that moves very slowly.
      • CRUST-outer layer. It is divided into slabs called tectonic plates (they float on the mantle).
    • Plates moves because of convection currents in the mantle.
    • Plate margins or plate boundaries are the places where plates meet.
    • THE THREE TYPES OF PLATE MARGIN
      • DESTRUCTIVE MARGINS
        • This is where two plates move towards each other. For example, along the west coast of South America.
        • When an oceanic plate meets a continental plate the denser oceanic plate is forced down into the mantle and gets destroyed.
          • CAUSES VOLCANOES AND OCEAN TRENCHES (very deep sections of the ocean floor where the oceanic plate goes down).
        • When two CONTINENTAL PLATES meet, the plates collide, and the ground is folded and force upwards to create mountain ranges.
      • CONSTRUCTIVE MARGINS
        • This is where two plates move away from each other, for example at the mid-Atlantic ridge. Magma (molten rock) rises from the mantle to fill the gap and cools creating new crust.
      • CONSERVATIVE MARGINS
        • This is where two plates are moving sideways past each other, or are moving in the same direction but at different speeds. For example along the West coast of the USA. CRUST IS NOT CREATED OR DESTROYED!
  • CONTINENTAL
    • TWO TYPES OF PLATES MADE OF CRUST.
      • Living with the physical environment-Section A-Tectonic Plates
        • THE EARTH'S STRUCTURE
          • CORE- ball of solid (inner) and liquid (outer) iron and nickel.
          • MANTLE- semi-molten rock that moves very slowly.
          • CRUST-outer layer. It is divided into slabs called tectonic plates (they float on the mantle).
        • Plates moves because of convection currents in the mantle.
        • Plate margins or plate boundaries are the places where plates meet.
        • THE THREE TYPES OF PLATE MARGIN
          • DESTRUCTIVE MARGINS
            • This is where two plates move towards each other. For example, along the west coast of South America.
            • When an oceanic plate meets a continental plate the denser oceanic plate is forced down into the mantle and gets destroyed.
              • CAUSES VOLCANOES AND OCEAN TRENCHES (very deep sections of the ocean floor where the oceanic plate goes down).
            • When two CONTINENTAL PLATES meet, the plates collide, and the ground is folded and force upwards to create mountain ranges.
          • CONSTRUCTIVE MARGINS
            • This is where two plates move away from each other, for example at the mid-Atlantic ridge. Magma (molten rock) rises from the mantle to fill the gap and cools creating new crust.
          • CONSERVATIVE MARGINS
            • This is where two plates are moving sideways past each other, or are moving in the same direction but at different speeds. For example along the West coast of the USA. CRUST IS NOT CREATED OR DESTROYED!
    • characteristics-  They are thicker (30-50 km)   and are less dense.

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