Why do most of the rivers in Africa have waterfalls before they flow into the sea?

What creates waterfalls in many African rivers?

Depending on the change of sea level, river flow, and geology (among other factors), falls or rapids may develop at the knickpoint. Many waterfalls have been created by glaciation where valleys have been over-deepened by ice and tributary valleys have been left high up on steep valley sides.

Why are most rivers in Africa not navigable?

But most rivers in Africa are not navigable due to water falls, weeds and being seasonal. Africa need to combine forces to utilise this rivers for irrigation, hydro electric power and combat the big problem of transport by overcoming weeds and waterfalls.

What are the major factors that affect the navigability of African rivers?

NOTEDeltaic mouths, mangrove swamps, the fluctuationregime of the rivers, and waterfalls and rapids acrossthe major rivers of Africa hinder the navigability oftheir courses. However, these rivers have high HEPpotential.

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Why are waterfalls temporary?

Eventually this overhang will collapse and the waterfall will retreat further upstream (1). This process continues until all the more resistant rock has been removed, the waterfall disappears and the river’s long profile is smoothed out, therefore a waterfall is only a temporary feature (1).

Which is the largest waterfalls in Africa?

Victoria Falls- Zimbabwe/Zambia Border #1

Victoria Falls has the largest volume of falling water, with over 5 million cubic meters of water dropping over every minute in peak season! This has earned it the title of the World’s Largest Waterfall.

What is the biggest waterfall in Africa?

KwaZulu-Natal

  • Howick Falls.
  • Ncandu Falls.
  • Tugela Falls – 948 m (3,110 ft) high, the highest waterfall in Africa.

Why Africa is referred to as the hottest continent?

Africa mainly lies within the intertropical zone between the Tropic of Cancer and the Tropic of Capricorn. … Because of this geographical situation, Africa is a hot continent as the solar radiation intensity is always high.

What percent of Africa is covered by desert?

The world’s largest desert, its size defies imagination: 3.3 million square miles or around 25 percent of Africa. Not surprisingly, the Sahara’s name in Arabic means simply “desert.”

Why Africa is also referred as the hottest continent?

It is also known as the world’s hottest continent. Complete Answer: … Africa is a hot continent as the heat of the sun is always strong there. Thus, warm and hot climates prevail all over Africa but the northern part is the most marked part by aridity and high temperatures.

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What are some reasons a river would be unnavigable?

Waters may be unnavigable because of ice, particularly in winter or high-latitude regions. Navigability also depends on context: a small river may be navigable by smaller craft such as a motorboat or a kayak, but unnavigable by a larger freighter or cruise ship.

What are the 10 major world rivers?

  • The Nile.
  • The Amazon River.
  • The Yangtze River.
  • The Mississippi River.
  • The Yellow River.
  • The Irtysh River.
  • Rom River.
  • The Congo River.

What are the 2 prerequisites of waterways to be navigable?

Answer: The two prerequisites of waterways to be navigable are as follows : Rivers, canals, backwaters and creeks which are deep enough t allow the ships and boats to navigate safely.

Where do waterfalls lead to?

The resulting erosion at the base of a waterfall can be very dramatic, and cause the waterfall to “recede.” The area behind the waterfall is worn away, creating a hollow, cave-like structure called a “rock shelter.” Eventually, the rocky ledge (called the outcropping) may tumble down, sending boulders into the stream …

Where do you usually find waterfalls?

Waterfalls commonly form where water rushes down steep hillsides in upland areas. They are typical of the upper valley but can be found in the rivers lower courses where the process of rejuvenation creates enough potential energy for vertical erosion to recommence closer to the mouth of the river.

How are waterfalls formed 6 marks?

A waterfall is an erosional landform, which occurs where there is a layer of hard rock on top of a layer of softer rock. Erosional processes such as hydraulic action and abrasion occur as the river flows downstream, however differential erosion takes place as the softer rock erodes faster.

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