Due to the pressure of the magma, causing the cracks. Heat transfer and magma into the crust
the temperature and pressure decrease. The tectonic subsidence become astronomical observatories in the vale
.Black later, when water flow accumulation is the sea. Fracture cause and a deep groove
magma is moving push up. Make the earth under the ocean disappeared
.On both sides, the expansion of the sea floor (Sea floor spreading) and cause the
middle ocean, such as the area the Red Sea, the Gulf of California. The East African Rift Valley, the
.There are traces of separate shallow earthquakes volcanoes and lava flows beneath the ocean.
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