+71) (2) 1.3.
Study FIGURE 1.3 which shows the longitudinal profile of a river.
13.1.
What is meant by the term base
()
1.3.2
Why is the sea regarded as a permanent base level?
{1x2) (2)
2.3.3.
What evidence in FIGURE 1.3, indicate that this river is graded?
{1x2) (2)
1.3.4.
Why will a drop in sea level change the grading of the river?
(2x2)
(4)
1.3.5.
Draw a simple longitudinal profile to show the impact of the drop in sea level,
mentioned in QUESTION 1.3.4., on the shape of longitudinal profile, (142) (2)
1.3.6. Explain how interaction between erosion and deposition in the upper and lower
course of a river to help maintain a graded profile.
(2x2) 14)