How are the segments of a crayfish different from those of an earthworm?

crayfish have experienced something called tagmosis where some of the segments have merged, thus they have heteronomous metamerism. the difference of the earthworms and crayfish is that earthworms have somewhat called homonomous metamerism - each of the segments looks like every other segment. 

earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

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