Intrusive extrusive

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Year 13 Edexcel A tectonic activity. The impact of tectonic activity on the landscape.

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Intrusive extrusive

  1. 1. EXTRUSIVE FEATURES
  2. 2. Lava Plateau <ul><li>These are formed by large outpourings of fluid lava from long narrow openings in the crust (fissures). </li></ul><ul><li>During each eruption the lava flows out from these openings, solidifies and builds a new layer each time forming layer upon layer of solidified basalt lava. </li></ul><ul><li>The plateau looks flat and featureless and often has little vegetation cover </li></ul>WHAT ARE THEY?
  3. 3. DECCAN PLATEAU <ul><li>Its in India </li></ul><ul><li>It is 700,000km squared in area. </li></ul><ul><li>It was formed by 29 lava flows from a hot spot which is now under Reunion Island in the Indian Ocean. </li></ul>FACTS?
  4. 4. Other famous plateaus? Columbia plateau in the USA and Antrim Plateau in Norther Ireland. Can you find out brief information about these too?
  5. 5. VOLCANOES Loads of different volcano types. <ul><li>Type depends on: </li></ul><ul><li>Type of lava/ eruption </li></ul><ul><li>Type of plate boundary </li></ul>
  6. 6. SHIELD VOLCANO What are its characteristics and why? CASE STUDY MAUNA LOA - HAWAII
  7. 7. COMPOSITE VOLCANO What are their characteristics and why? CASE STUDIES: MOUNT ST HELENS, MONTSERRAT
  8. 8. INTRUSIVE FEATURES
  9. 9. Batholiths WHAT ARE THEY?
  10. 10. Sills WHAT ARE THEY?
  11. 11. Dykes WHAT ARE THEY?
  12. 12. Isle of Arran Case study
  13. 13. Northern Hills - Arran WHAT FEATURE?
  14. 14. Kidonan Shore - Arran WHAT FEATURE?
  15. 15. Drumadoon point - Arran WHAT FEATURE?
  16. 16. SEISMIC IMPACTS <ul><li>FAULTING </li></ul><ul><li>The outer part of the earth is cold so when it is stressed it breaks easily if pushed quickly. </li></ul><ul><li>These breaks (caused by seismic activity) are called FAULTS. </li></ul><ul><li>They tend to occur on the boundaries between plates but sometimes in the middle of plates too. </li></ul><ul><li>Faulting occurs in the top 10 – 15km of the earth’s crust. </li></ul>
  17. 17. NORMAL FAULTS <ul><li>Hanging wall moves down leaving a very steep fault plane. Usually caused by the plates moving apart (divergent) </li></ul><ul><li>The result of this fault movement is a cliff like feature called a fault scarp. A number of these were found in the Sichuan province in China after the earthquake there. </li></ul>
  18. 18. REVERSE FAULTS <ul><li>These occur when the hanging wall moves upwards. The forces here are compressional (convergent boundaries) </li></ul><ul><li>A number of these were found in the Sichuan province in China after the earthquake there. </li></ul>
  19. 19. Sichuan Province quake <ul><li>12 th May 2008 </li></ul><ul><li>Collision boundary (Indo Australian and Eurasion) </li></ul><ul><li>7.9 Richter scale. </li></ul><ul><li>60,000 plus deaths </li></ul>
  20. 20. The San Andreas Fault
  21. 21. RIFT VALLEYS - East Africa

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