Most rivers don't have gentle gradients in the upper course or headwaters, rather most rivers always have steep gradient in their upper course. The upper course of a river is known as the headwaters region. But in their downstream regions, most rivers usually have relatively gentle gradients.
It is a gemstone that is found on the African continents and is made pos the silica materials and has compounds of the aluminum and iron and the potassium lithium and the sodium and this is classified as a semi-precious stone. The metamorphic rocks and the sandstone consists of these minerals and the colors of the gemstone cane alter by the heat treatment.
