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This has to do with the flow of water churning the contents of the river, striking objects against each other (such as stones) and the friction of water against the surfaces of the river's edge and the items at the bottom of the river, such as driftwood and rocks that have been carried by the current downstream. Lakes typically are the origin points of rivers and streams, and thus have low current at the bottom of the body of water, therefore less friction is generated to break down large objects into smaller objects. The edge of the lake, however, is often characterized by sand and small bits of broken objects, due to the motion of waves that travel along the surface of the lake to the water's edge. These objects are worn smooth and continue to break down into smaller and smaller items as they continue to be affected by the tides and churning force of the water on them, rolled back and forth against other objects.
For a good example of friction over time, take a piece of sandpaper and apply it to a section of a board of wood for about five minutes a day. The low amount of friction does not appear to affect the wood initially in any significant way, though you'll have to blow off the dust every now and then. Repeat this same vigorous treatment every day for a month, and you'll wear down a smooth patch in the board to the point that it will easily break if minimal pressure is applied to that point. Apply this same principal to constant application of force from the water over time, and you can see how water, which is constanctly cycled across the surface of the world through atmospheric and environmental action, wears away the sharper features of terrain from large-scale events such as earthquakes and volcanoes, leaving rolling hills and soft valleys.
What else can I help you with?
Which type of rock would likely be found at the bottom of a river bed?
sedimentary
Where do you find flint?
You can find flint by digging up gravel. There is a chance you will get a piece of flint from digging up one block of gravel, though most of the time you only get gravel. Gravel can be found in caves, by a river bank, and the bottom of the ocean (good luck digging up gravel down there!). Gravel really doesn't have much use, though it is known for making "gravel elevators." Flint, however, is used to make arrows for bows and arrows.
What is found in a sedimentary rock?
the solid material sattles at the bottom of a liquid is called sedimentary rock example when there is rain the small pieces of clay,gravel flow to river and streams etc there pieces are hardened and form sedimentry rock
What is Sedimentary rock is found in?
the solid material sattles at the bottom of a liquid is called sedimentary rock example when there is rain the small pieces of clay,gravel flow to river and streams etc there pieces are hardened and form sedimentry rock
How much gravel do you need?
For a fish tank, you need enough gravel to make a thin layer on the bottom of the aquarium. For an outdoor walkway, you need much more.
How do you recover placer gold?
Placer gold is found in river beds. The gold is heavy and settles and is concentrated in the river gravel. You mine it by digging up this gravel, placing it on a sluice with a rough bottom surface (e.g. a sheep fleece) and washing it down the sluice with river water. The gold gets trapped in the fleece and when this is dried the gold can be shaken out. You can also do the same thing (in smaller quantities) with a wooden or rusty metal miners pan (hence panning for gold).
How can you obtin gold from river water if it contains sand and gravel which process?
To obtain gold from river water containing sand and gravel, one common process is panning. Panning involves agitating the mixture in a pan, allowing the gold to settle to the bottom due to its high density. The lighter sand and gravel can then be washed away, leaving the gold behind.
What was a gold pan used for?
Panning for gold. You go to the river get a bit of water, some dirt from the bottom of the river and then swish it around and over the lip of the pan. Eventually, you may have bits of gold in the bottom of the pan because the gold is heavier than the water and of the sand/gravel from the river. It is a wet job.
A pile of sand and gravel deposited on the inside of a meander?
This is likely an oxbow lake, formed when a meander loop is cut off from the main river channel. The sand and gravel have been deposited in the oxbow lake due to reduced water velocity, creating a sediment buildup. Over time, vegetation may establish in the oxbow, further stabilizing the bank and bottom.
Is river rock and crushed gravel similar?
River rock and crushed gravel are both types of gravel but have different shapes and sizes. River rock is typically smooth and rounded, while crushed gravel is crushed and has more angular edges. River rock is often used for decorative landscaping, while crushed gravel is commonly used for driveways and pathways.
Are dinosaurs bones found in swamps or rivers?
yes they are often found in bolders at the bottom of the river
What are the characteristics of siltstone?
its grainy like silt found in a river only the grains are made of stone so its like a smaller version of gravel
