Unit 7: Dynamic Planet: Earthquakes  Volcanoes  Lecture 1

Unit 7: Dynamic Planet: Earthquakes Volcanoes Lecture 1 PowerPoint PPT Presentation


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Earthquakes . Vibration of Earth produced by the rapid release of energy Associated with movements along faults Explained by the plate tectonics theory Rocks "spring back" ? a phenomena called elastic reboundVibrations (earthquakes) occur as rock elastically returns to its original shape . Earthquakes .

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Unit 7: Dynamic Planet: Earthquakes Volcanoes Lecture 1

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1. Unit 7: Dynamic Planet: Earthquakes & Volcanoes Lecture 1 Objectives: E3.4A - Use the distribution of earthquakes and volcanoes to locate and determine the types of plate boundaries. E2.2C - Describe natural processes in which heat transfer in the Earth occurs by conduction, convection, radiation.

2. Earthquakes Vibration of Earth produced by the rapid release of energy Associated with movements along faults Explained by the plate tectonics theory Rocks "spring back" – a phenomena called elastic rebound Vibrations (earthquakes) occur as rock elastically returns to its original shape

3. Earthquakes Locating an earthquake Earthquake zones are closely correlated with plate boundaries Circum-Pacific belt Oceanic ridge system

4. Magnitude 5 or greater earthquakes over a 10 year period

5. Volcanoes Global distribution of igneous activity is not random Most volcanoes are located on the margins of the ocean basins (intermediate, andesitic composition) Second group is confined to the deep ocean basins (basaltic lavas) Third group includes those found in the interiors of continents

6. Locations of some of Earth’s major volcanoes

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