Answer:
The foremost British interest in Egypt was always because of its strategic position. However profitable contracts and business was in the country, it was the fact that Egypt lay between Britain and India that made it so vitally important for the British.
Hope it helps
Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
Note: This information has been taken out of a website.
A river's width and depth increases as more water is added from tributaries.
The answer is deep sea trenches