Leather shoes are made from natural polymers; raincoats are made from synthetic polymers."
They were legally bound to the land by contract and debt. The land owners paid for the serfs to come over from a different country. The serfs then were legally bound to the land until their debt was paid off.
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Seismic waves are prodused from volcanoes eruptions, earthquakes and other seismic sources. But the seismometer is the #1 instrument to use to measure a seicmis wave. Theyre can also be seismograph and a seismogram.
