Lesson+4+Continental+Drift+Reborn

Echoes bounce off the ocean floor from how deep beneath the ocean floor?
media type="file" key="Mapping the ocean bottom.mov"

How fast are the plates moving?
media type="file" key="discovery of mid ocean ridges.mov"

#5 - Take a look at the following animation and see if you can see the volcano/earthquake/plate pattern:
plate boundaries media type="file" key="ring of fire world map.swf"

#6 - drag the compass back and forth across the underwater volcanoes and see what happens:
media type="file" key="seafloor spreading interactive.swf"

==**Web sites http://www.classzone.com/books/earth_science/terc/content/investigations/es0801/es0801page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es0802/es0802page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es0810/es0810page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es0901/es0901page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es1003/es1003page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es1001/es1001page01.cfm?chapter_no=investigation http://www.classzone.com/books/earth_science/terc/content/investigations/es1101/es1101page01.cfm?chapter_no=investigation**==