GEY 111_ Unit 8 LAB.pdf - Lan Nguyen GEY 111 Professor...

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Lan Nguyen GEY 111 Professor: Alison Angela Introduction to Plate Tectonics Using Google Earth Location 1: Atlantic Ocean 1. Average depth: 3,646 m ; Maximum Depth: 8,486 m 2. I think I see The Mid-Atlantic Ridge is located at the juncture of crustal plates that form the floor of the Atlantic Ocean. The ridge is equidistant between the continents on either side of it . Mid-Atlantic Ridge, submarine ridge lying along the north-south axis of the Atlantic Ocean; it occupies the central part of the basin between a series of flat abyssal plains that continue to the margins of the continental coasts. 3. The plate that separates South American and African Plates is in the middle of Atlantic Ocean as a divergent boundary. 4. The Mid Atlantic Ridge, like other ocean ridge systems, has developed as a consequence of the divergent motion between the Eurasian and North American, and African and South American Plates. As the mantle rises towards the surface below the ridge the pressure is lowered (decompression) and the hot rock starts to partially melt. This produces basaltic volcanoes when an eruption occurs above the surface and characteristic basalt “pillow lava” in underwater eruptions. In this way, as the plates move further apart new oceanic lithosphere is formed at the ridge and the ocean basin gets wider. This process is known as “sea floor spreading” and results in a symmetrical alignment of the rocks of the ocean floor which get older with distance from the ridge crest.
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