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Lect 3 • Describe earth structure and explain plate tectonics theory • Describe three major plate boundary types and the associated hazards • Describe the role plate tectonics plays in the development of earths landscapes Continental drift theory – Alfred Wegener Drift of south Africa plate and south America geometry fit together. Fossils found were matched Glacial striations also match across the continental edges, suggestion a common origin point. However, earth’s mantle is supposed to be solid. So how can continents drift. Theory was rejected. Magnetization patterns on sea floor caused by magnetic field of the earth. However this magnegtic field is NOT CONSISTENT. This is what causes the white black lines. Inclination – Tilt of a compass needle from the horizontal. Depends upon… • Normal or reverse polarity. • Latitude. Volcanic rock erupts and magnetic minerals are able to move when its hotalign with earth magnetic field and then cool down, set in place. Oldest ocean floor is the deepest Youngest ocean floor is most shallow....