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the top layer of grassy soil, sometimes used to build houses
sod
an animal, such as a horse or a mule, that is used to carry heavy loads
pack animal
to leave one place to settle permanently in another
emigrate
a home and the land surrounding it
homestead
a boat powered by a steam engine
steam boat
a boat with a long ridge on the bottom used to navigate rivers
keelboat
freedom from external control; supreme power or authority
sovereignty
a rock or mineral from which metal can be obtained
ore
a flat grassland
prairie
a motor that uses steam to work
steam engine
