The changing earth


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The changing earth

  1. 1. The Changing Earth Jenny Andrea Quiroz
  2. 2. It refers to all the changes that the Earth has had through time. The Earth has had significant changes that have changed the appearance of the Earth as we know it today. There are many factors which are involved in the transformation of the Earth’s appearance one of them is the movement of the plates.
  3. 3. Plates Layers Magma Crustal Rocks
  4. 4. • Plates: it is a scientific theory that describes the large scale motions of the earth's lithosphere. • Layers: the internal structure of the Earth, like an onion. • Magma: the mixture of molten rock or semi molten rock which is founded beneath the surface of the Earth. • Crustal Rock: it is the magma when it is harden.
  5. 5. When the molten layer moves around with very slow movements, plates move around too. When plates move around a rock liquid called Magma rises and plugs the gapes, when it is harden it is called crustal rock.
  6. 6. Magma harden Crustal Rock Deep ocean Trench Continents collide Mountain Ranges
  7. 7. Plates Movements Plates move around and push one beneath the other. They move sideways too in an average of 2 to 3 inches and 4 to 7 cm in a year. Over million of years it means a significant change in the Earth’s appearance.
  8. 8. Continental Drift Alfred Wegener (Nov. 1, 1880 – Nov. 1930)Abraham Ortels (14 April 1527 – 28 June 1598) In the early 1900s, they suggested the idea of continental drift. It was only confirmed until 1960 when some scientists continued with the study of the soils.
  9. 9. Pangaea It is an hypothetical theory of a supercontinent where all the landmasses were together. Over 200 million of years ago all the continents were together in just one and it was surrounded by one Ocean.
  10. 10. Continental Drift Around 130 million of years the Earth started to break up. Over 60 million of years ago Pacific Ocean appeared and India was moved toward Asia. Finally the Earth took the form as we know it today.
  11. 11. Fossils Continental Drift The fossils that were found in different continents support the idea of continental drift because it was not possible that they have swum across the ocean.
  12. 12. Future Continental Drift “Aim at heaven and you will get earth thrown in. Aim at earth and you get neither.” C. S. Lewis Plates are still moving, after many years the Earth’s appearance will be different.
  13. 13. Vocabulary • Squeeze: v. /skwiːz/ to grip or press firmly. • Drift: v. /drɪft/ to move aimlessly from place to place or from one activity to another.
  14. 14. • Crack: v. /kræk/ to break or cause to break without complete separation of the parts. • Plug: v. /plʌɡ/ To fill (a hole) tightly with or as if with a plug
  15. 15. • Ridge: n. /rɪdʒ/ a long narrow raised land formation with sloping sides esp. one formed by the meeting of two faces of a mountain. Taken from: Thanks