The gap is caused by erosion. Horizontal erosion is also known as lateral erosion. It is the wearing away of earth from a footpath or river bank. Lateral, Vertical and Diagonal. Lateral area excludes the areas of the top and bottom faces, which are included in the surface area. Lateral cabinets slide out, and let you see each folder. The greatest difference when it comes to choosing a new 2 drawer lateral file cabinet seems to be in deciding how tall you need to go up in height. Lateral refers to the outside of the ankle while medial refers to the inside or towards the midline of the body.
Abrasion is where flowing water picks up rocks and moves them along in it's current. It can cause damage to the side of rivers Lateral Erosion as well as the riverbed Vertical Erosion. Abrasion can also be defined a lot simpler by just saying "When waves throw rocks up at cliffs" etc.
This is not to be confused with Attrition though. The torsional rigidity comes from the torso. The lateral rigidity would come from the arms and the legs becoming stiff. Horizontal, vertical, lateral. The river valley becomes flat in its lower course due to the levels of erosion occurring in the river itself. In the upper course, the river's energy is used for vertical erosion downward erosion in order to get to sea level.
That's why you see steep V-shaped valleys or Gorges being formed. However, in the lower course when the river is at sea level, a lot of this erosion becomes lateral horizontal which is why you see rivers becoming a lot wider in the lower course. Therefore, because the river is no longer eroding downwards there's no longer a difference in height between it and its valley, so the river valley becomes flat.
The hydraulic action of the current hits one side of the bank with enough energy so that the material of the eroded bank falls into the stream and disintegrates. At the same time, the stream moves outwards towards towards the direction of erosion. Log in. Study now. See Answer. Best Answer. Study guides. Physics 20 cards. Which term explains whether an object's velocity has increased or decreased over time. Which of these is a characteristic of nonmetals. What is the only factor needed to calculate change in velocity due to acceleration of gravity 9.
What term is used to describe splitting a large atomic nucleus into two smaller ones. What angle is between 90 and What condition has symptoms that include ringing buzzing or roaring in the ears or head. Lateral erosion makes a river wider. This occurs mostly in the middle and lower stages of a river. There are four main processes of erosion that occur in rivers. These are:.
Hydraulic action. The pressure of water breaks away rock particles from the river bed and banks. The force of the water hits river banks and then pushes water into cracks. Air becomes compressed, pressure increases and the riverbank may, in time collapse. Where velocity is high e. Near waterfalls and rapids, the force may be strong enough to work on lines of weakness in joints and bedding planes until they are eroded.
The sediment carried by a river scours the bed and banks. Where depressions exist in the channel floor the river can cause pebbles to spin around and turn hollows into potholes.
Eroded rocks collide and break into smaller fragments. The edges of these rocks become smoother and more rounded. Attrition makes the particles of rock smaller. It does not erode the bed and bank. Pieces of river sediment become smaller and more rounded as they move downstream. Carbon dioxide dissolves in the river to form a weak acid. This dissolves rock by chemical processes. This process is common where carbonate rocks such as limestone and chalk are evident in a channel.
Transportation of material in a river begins when friction is overcome. Material that has been loosened by erosion may be then transported along the river. There are four main processes of transportation. Suspension is when material made up of very fine particles such as clay and silt is lifted as the result of turbulence and transported by the river. Faster-flowing, turbulent rivers carry more suspended material. This is why river appear muddy as they are approaching bankfull discharge and towards the mouth of the river where velocity is greater as is the occurrence of finer sediment.
Solution is when dissolved material is carried by a river. C - in the lower course there is a lot less erosion, with only some lateral erosion. The channel is at its widest and deepest.
River profiles - cross profiles and long profiles Long profile A long profile shows how the river changes over its course from its source where it starts to its mouth where it meets the sea. Cross profile A cross profile is a view of the valley from one side to another.
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