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SEA FLOOR SPREADING

SEA FLOOR SPREADING. Plate Tectonics. CONTENT GOAL: To be able to explain sea floor spreading. BELL WORK 1/29 What process causes plates to move?. BELL WORK 1/30. Write this down on page 16. Watch video for answers Who were the two scientists who helped discover continental drift?

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SEA FLOOR SPREADING

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  1. SEA FLOOR SPREADING Plate Tectonics

  2. CONTENT GOAL: To be able to explain sea floor spreading.

  3. BELL WORK 1/29 What process causes plates to move?

  4. BELL WORK 1/30 • Write this down on page 16. Watch video for answers • Who were the two scientists who helped discover continental drift? • What technology helped explain sea floor spreading

  5. Sonar • Sonar = Sound Navigation and Ranging

  6. Sonar • Used on boats to navigate around objects • Used by fishermen to find large schools of fish • Bats and whales use echolocation(like sonar) to communicate, search for prey, and work their way through darkness

  7. MILITARY USES • WWII to detect U-boats (German Submarines) problems though • Cold War find nuclear warheads hidden underwater away from satellites and air strikes

  8. How Sonar Works • A noise is generated • The time it takes sound to bounce off an object and return • You can gauge how far away an object is

  9. Types of Sonar • Passive – underwater microphone • Active – generate their own sound waves • Emits a sound • Receiver measures how long it takes for sound wave to return

  10. Calculating Depth of Sea Floor • D = (T/2)(V) • T = time in seconds • V = speed of sound = 5000ft/second

  11. SS Sapona • 1926 SS Sapona used to transport alcohol during prohibition ran aground during a hurricane • Today it sits 54 miles from the beaches of Miami • How deep is water around SS Sapona if it can still be seen above the water?

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