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1. Introduction to Marine Science 1.1 Structure of the Earth 1.2 Plate tectonics

Learning outcomes<br>Candidates should be able to:<br>(a) describe the structure of the Earth as core, mantle and crust<br>(b) outline plate tectonic theory

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1. Introduction to Marine Science 1.1 Structure of the Earth 1.2 Plate tectonics

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  1. Earth’s Structure By Anto

  2. Lesson Objectives • Describe the structure of the Earth, i.e. core, mantle, crust. • Explain the plate tectonic theory

  3. EARTH’S STRUCTURE

  4. Earth is divided into three layers CRUST MANTLE CORE

  5. Earth's Layers

  6. Core • It is the inner layer of earth • The temperature of core is still hot. • Rocks will be in liquid state

  7. Mantle • It is the middle layer of earth • It consist of layers of Molten Rock • It has high density of tar

  8. Crust • It is the outer layer of earth • It is very thin • Pieces of earth crust is called Plates

  9. Plate Tectonic Theory By Alfred Wegener (1912)

  10. Plate tectonic theory • Alfred Wegener put forward [1912]. • 225 million years ago there was only one continent called Pangaea. • 200 million years ago they split into separate pieces. • Which drift apart and form different continents. • Continents are up on the plates. • It move due to the tectonic activity.

  11. Continental drift 225 million years ago

  12. 200 million years ago

  13. 135 million years ago

  14. 65 million years ago

  15. Present Day

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