3 Wegener’s Continental Drift Hypothesis States that the continents once formed a single landmass, broke up, and drifted to their present locations.His evidence includes:Shape of the continentsFossil evidenceSimilar rocks
4 The shape of some of the continents look like they could fit together like …
13 …so why was his hypothesis almost universally rejected? He could not satisfactorily explain the forces moving the continents.Scientists could not explain how the continents were moving.Flaws in Wegener’s data had the continents moving much to far and too fast.
24 Magnetic Reversals and Sea-Floor Spreading The molten rock at the mid-ocean ridges contains tiny grains of magnetic minerals like iron.These minerals align with the magnetic field of the Earth while liquid, then when they cool and harden, they make a record of the magnetic poles.This record is then carried slowly away from the spreading center of the ridge as sea-floor spreading occurs.