Roth
Fonsa a chasann ar acastóir is ea roth (roth rothair, roth stiúrtha, roth muilinn).
Is minic brí mheafarach leis: rothaí an tsaoil, d'iompaigh an roth air agus mar sin.
Iompar
Tá formhór na gcóracha iompair talún i dtaobh leis ar an roth chun imeacht. Bíonn rothaí faoi rothair, faoi thraenacha, faoi ghluaisteáin agus faoi thrucailí. Bíonn eitleáin i muinín rothaí agus iad ag tuirlingt ar rúidbhealach.
Is é an fáth ar féidir le roth casadh chomh tapa sin nach bhfuil uillinn air.
Muilte
Baineadh leas as rothaí i muilte freisin. Bíonn roth muillinn sna muilte chun cruithneacht, eorna, coirce, arbhar agus gránaigh eile a mheilt le haghaidh plúir. Chuireadh sruth uisce roth muilinn ag gluaiseacht, cé go mbaintear feidhm as aibhléis anois chuige.
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