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Bellwork

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  1. Bellwork • Get Textbook—Chapter 2 • Scientists have evidence that the center of the earth is active with intense heat and pressure. Movements deep within the earth cause changes to the earth’s surface • What is the interior of the earth like?

  2. Haley’s Comet Asteroids

  3. Asteroids • Where & when did the asteroid kill off the dinosaurs? • What was the immediate impact of the asteroid hit? • How did the asteroid bit change life on earth and how long did the effects last? • What continents were affected most?

  4. Answers • -near Yucatan Peninsula • Impact- dug a huge crater, vaporized limestone and seawater, created a fireball-thousands of miles • Changes-skies darkened for several months, acid rain poisoned lakes and rivers-705 species died • Greenhouse existed –plants/animals survived • North/south America

  5. Dead Sea

  6. Dead Sea

  7. Earth’s water • When you turn a faucet on, do you ever wonder where the water comes from? What is the source of the water you use to drink, cook and bathe?

  8. Water- 70% • Liquid- rivers, lakes, oceans • Gas- atmosphere ---water vapor • Frozen- glaciers & ice sheets

  9. Earth ‘s Water-70%

  10. Desalination- • Water in oceans- very salty • Process-called desalination-removing of salt content….becomes freshwater • Impact- of water • Meets everyday needs • Towns-urban areas developed along shore/lakes • Groundwater-beneath earth(rain &melted snow • Aquifers-underground porous rocks

  11. Water Cycle • Evaporation—changing liquid into vapor/gas • Condensation- warm air cools, changes back into liquid water-forms clouds • Precipitation- rain/snow/sleet- falls to the ground • Surface Runoff- water collects in rivers, lakes and oceans • http://education.jlab.org/reading/water_cycle_r.html

  12. Question • Create a diagram showing the four main stages of the water cycle

  13. Tectonic Plates

  14. Divergent Plates

  15. East African Rift

  16. Tanzanian Rift Valley

  17. Icelandic Rift

  18. Convergent Plates

  19. The Indian Plate vs. The Eurasian Plate

  20. The Himalaya

  21. Continent to Continent Collisions

  22. Continent to Ocean Collisions

  23. Ocean to Ocean Collision

  24. San Andreas Fault

  25. Cement-lined Ditch in Guatemala

  26. Red- convergent Green – divergent Purple - transform

  27. Cali 1994 6.7

  28. Cali ‘94 6.7

  29. Alaska 1964 9.3