Answer:
Definition: U-shaped valleys form through glacial erosion. Glaciation develops in established v-shaped river valleys where the ice erodes the surrounding rocks to create a “U” shaped valley with a flat bottom and steep sides. Glacier movement is driven by gravity
The Presidential election in Nigeria in 1999 was significant
because it is the first election after the 1993 coup and it is the first
election of the Nigerian republic. In this election, Olusegun Obasanjo won over
Olu Falae. 62.78% of votes was casted under Obasanjo.
Until the early Proterozic there were only negligible amounts of free oxygen in the atmosphere