Most potassium occurs in the Earth's crust as minerals, such as feldspars and clays. Potassium is leached from these by weathering, which explains why there is quite a lot of this element in the sea (0.75 g/liter). Minerals mined for their potassium are pinkish and sylvite, carnallite and alunite.
oppression - the act of subjugating by cruelty; the tyrant's oppression of the people. 2. oppression - the state of being kept down by unjust use of force or authority: after years of oppression they finally revolted. subjection, subjugation - forced submission to control by others. yoke - an oppressive power; under the yoke of a tyrant; they threw off the yoke of domination.
Definition of apple. 1 : the fleshy, usually rounded red, yellow, or green edible pome fruit of a usually cultivated tree (genus Malus) of the rose family; also : an apple tree â compare crab apple.