Exam (elaborations)
• A Level Geography EXAM WITH VALID QUESSTIONS AND ANSWERS
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• A Level Geography EXAM WITH VALID QUESSTIONS AND ANSWERS
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A Level Geography EXAM WITH VALID QUESSTIONS AND ANSWERSExogenic river material - ANSWER ;Massmovement
Erosion
Sheetwash
Endogenic river material - ANSWER ;From stream bed and bank
Bed-load - ANSWER ;Includes larger particles which cannot be picked up by the
current. They can be exogenic or endogenic
Saltation - ANSWER ;Sand, pebbles and gravel are temporarily lifted and bounced
along the river bed in a bouncing manner
Traction - ANSWER ;This is when the largest cobbles and boulders are rolled along the
river bed. The largest of those may only be moved during times of extreme flood
Suspended load - ANSWER ;This consists of fine particles of clay and silt which are
dislodged and carried by turbulence in a fast flowing river. This load is held in
suspension within the river body, and increases in amount towards the rivers mouth
giving it its brown or black color
Solution - ANSWER ;This involves dissolved particles, especially if the bedrock is
soluble and the river contains acid. ( can come from erosion, pollution and chemical
weathering
Conditions for braiding - ANSWER ;1: variable discharge
2: banks Made up of loose incoherent material
3: the river must be transporting a large load
Main features of braiding - ANSWER ;1: vegetated islands
2: un vegetated bars
3: eroded banks
Braiding - ANSWER ;For braiding to take place a river needs to have a variable
discharge, banks made of loose incoherent material and a large load. During high
discharge, the velocity of the river increases, thus eroding its banks and carrying along
all the eroded material downstream. During times of low discharge, deposition occurs
within the river channel and after this process has repeated itself a few times, the
deposited sediments will accumulate and eventually rise above the water level to form
elongated bars. After time some of those bars get colonized by vegetation and plants
start to grow, these are called vegetated islands. Vegetated islands are more stable and
last longer that un vegetated bars because the vegetation binds the soil together and
trap more sediments, making it more stable. But they are not permanent as they also
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