17.2 – Seafloor Spreading.

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Seafloor Spreading What evidence do scientists have to support the fact that the Earth’s crust is continuously moving?

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Presentation transcript:

17.2 – Seafloor Spreading

Seafloor Spreading Harry Hess was the first scientist to come up with the idea called seafloor spreading This states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches This is caused because magma is hotter and less dense then surrounding material and is forced up at ocean ridges filling a gap When this magma hardens it turns into new ocean floor

The Missing Link Seafloor spreading was the link that was missing for Wegener Seafloor spreading is the answer of how the continents were drifting apart