Everything about them. Do your own research!!! It would take me longer to type you an explination than if you just got off your butt and did the reseach yourself!!!How do ocean ridges and deep-sea trenches support the theory of seafloor spreading?
The fact that they are always parallel with the central volcanic feature (such as the Mid-Atlantic rift). As new volcanic material is created in the rift, the two tectonic plates bordering the rift are pushed apart, creating a highly symmetrical patterns of ridges. Also, when molten rock cools, it fixes the magnetic domains in it's bulk in the direction of the Earth's magnetic field at the time it congeals. The Earth's magnetic field has in the geologic past flipped North-South many times. This is recorded in the pattern of parallel bands spreading from the mid ocean trench. Cores taken from the sea floor shows a very clear pattern of bands, like a magnetic tape, spreading from the center.
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