three.
It is formed by the confluence of three other rivers, the White Nile (Bahr-el-Abiad), Blue Nile (Bahr-el-Azrak) and River Atbara. The Blue Nile (Bahr-el-Azrak) flows from Lake Tana (Ethiopia), converging with the White Nile in Khartoum, capital of Sudan
Answer and Explanation:
- the upper boundary of sub alpine ecosystem is known as tree line and lower boundary of sub alpine ecosystem is known is montane zone
- the tree line is the edge of habitat at which trees are capable of growing it is found at very high elevation beyond this there is no life of trees
- the upper montane zone is vegetarian type generally found above the mixed coniferous forest and bellow the sub alpine forest
HOW DOES IT VARIES ACROSS THE STATE :
- the marginal conditions make the sub alpine ecosystem sensitive to environment change
- the long lived nature of the sub alpine species make the zone a good study system
Answer:
Castilla del Oro
Explanation:
Crossing the isthmus, Balboa discovered the “South Sea” (Pacific Ocean) in 1513 and claimed for Spain all the lands it touched. Balboa cultivated good Indian relations, made extensive explorations, and found enough gold and pearls to make Castilla del Oro, as it was called, the first profitable colony in the New World.
