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Ur

En ur er oppsamling av løst og dårlig sortert steinmateriale i bunn av en svært bratt helning, for eksempel ved foten av fjellklipper, vulkaner eller bratte dalersider. Steinmaterialet løser pga. erosjon og samler seg iht. loven om tyngdekraft. De største steinen ligger derfor gjerne underst og nederst. Jo brattere det er jo mer kjegleformet blir derfor ura.

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