They are formed by several factors along the time, including weathering.
Erosion Shapes. Lowest level directs.
One of the ways is that it carves it by weathering and eroding it away.
Wheathering breaks down rocks and erosion transport it away by wind,rivers,sea
Generally, grains of rocks and minerals can be any shape and is usually dependent on the type of erosion and/or weathering. Type of erosion/weathering|Grain shape None |Angular Water |Round, Smooth Wind |Round, Pitted Glacial |Semi-round to Angular with parallel scratches None |(As formed) Physical |Angular Chemical |(In solution)
Draw a shape. Every time your pencil changes direction, an angle is formed. A rectangle has four corners, all right angles.
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Faster river velocities are capable of carrying greater amounts of bedload and transporting them farther and faster. The shape of the sediments of the bedload would therefore be exposed to more physical weathering which would progressively round the sediments and also decrease their size.
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Weathering
By the moving air
Weathering and erosion shape earths surface by changing earths surface by having extreme forces that change earth.
Weathering rounded the mountains by breaking down jagged peaks.
mechanical weathering