Geosphere 1:23 - Plate tectonics continental drifts etc Continental drift theory needed a reason for their drift plate tectonics and sea spreading

Geosphere 1:23 - Plate tectonics continental drifts etc...

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1/23/17 Plate tectonics, continental drifts, etc. Continental drift theory needed a reason for their drift, plate tectonics and sea spreading explained that Rock on land is less dense than the rocks in the ocean, creates differences of mass and density of the plates Oceanic plates are denser; land plates are less dense Sial, continental, 2.8g/cm^3 VS Sima, oceanic, 3.0g/cm^3 Iceland sits on top of a diverging plate boundaries, not dangerous. Tectonic activity, magma activity, volcanic activity. Lots of renewable energy Himalayas, two plates slamming against each other. The plates push against each other to create the mountains. Himalayas are constantly growing up, earthquake zone but no volcanic activity, violent natural disaster India was once an island, was pushed into Asia about 10 million years ago. The island
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