Page 58 - Geography for Secondary Schools Student’s Book Form One
P. 58
Geography for Secondary Schools
Student’s Book Form One
FOR ONLINE READING ONLY
Figure 4.8: The Great East African Rift Valley
Basins
A basin is a natural depression or bowl-shaped hollow on the earth’s surface, formed
when part of the land sinks due to earth’s movements. These basins vary in size, with
some occupied by water. Basins collect water and sediments from surrounding land
surfaces. Some of the basins are found in oceans (ocean basins) or in seas (sea basins) or
in lakes (lake basins). Other basins are found higher above sea level and are surrounded
by mountains. Basins situated above sea level are drained by rivers and their tributaries
are called river basins. These river basins include the Congo River Basin in Africa and
52
18/10/2024 18:32:42
GEOGRAPHY (F1) TO PRESS.indd 52 18/10/2024 18:32:42
GEOGRAPHY (F1) TO PRESS.indd 52
