Larger, heavier particles like pebbles and sand are deposited first, whilst the lighter silt and clay only settle if the water is almost still. The flow of water is strongest on the outside of river bends, eroding the bank, but is slowest on the inside of the bends, allowing deposition of sand and gravel.
What are large boulders transported by in a river?
The correct answer is B. Traction .
Which of the following would be deposited by a river last?
Silt would be deposited by a river last.
What are large rocks transported by?
Rivers and streams can move pieces of rock. This is called transport . Fast-flowing rivers can transport large rocks, but slow-moving rivers can only transport tiny pieces of rock.
How does weathering by exfoliation happen quizlet?
Exfoliation mean shedding or casting off in layers. This is what happens to rocks affected by this type of weathering. Extreme daytime heating causes outer rock layers to heat up and expand away from the cooler internal parts of rock . At night, when the temperature drops quickly, the outer layers cool and contract.
What slows down a river?
Broader flat channels tend to slow a river down. ... Generally, anything that increases the surface area of the channel, against which the water flows will tend to slow the flow because of the increase in friction. Anything that reduces surface area also reduces the amount of friction and causes faster flow.
What would be carried by suspension?
Definition: Suspension is a method of transporting very fine sediment in a river . The sediment is probably eroded from larger rocks upstream and is then carried in the water. When the sediment is deposited from the water it is known as silt.
What is solution in a river?
Solution – minerals are dissolved in the water and carried along in solution . Suspension – fine light material is carried along in the water. Saltation – small pebbles and stones are bounced along the river bed. Traction – large boulders and rocks are rolled along the river bed.
What is backwash in geography?
When a wave breaks, water is washed up the beach. This is called the swash . Then the water runs back down the beach, which is called the backwash . ... This means that the beach increases in size . If the swash is weaker than the backwash (destructive wave), very little sediment is carried up the beach.
What happens when rocks that contain iron undergo oxidation in air?
Oxidation is another kind of chemical weathering that occurs when oxygen combines with another substance and creates compounds called oxides. ... When rocks, particularly those with iron in them, are exposed to air and water, the iron undergoes oxidation, which can weaken the rocks and make them crumble .
What happens to a rock in a river?
Erosion of River Rocks
Erosion occurs when the pieces broken from the rock get carried away by the river . ... Eventually, a narrow stream widens into a large river. This slows the speed of the water, and some of the broken pieces of river rocks (sediment) fall to the bottom of the river bed.
What are the materials transported due to erosion called?
Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement. ... This transported material is called sediment .
What is deposition rock cycle?
This process is called deposition. During deposition particles of rock are laid down in layers . Heavier particles are normally dumped first and then covered by finer material. Layers of sediment build up over time. These layers form a sedimentary sequence.
What are some similarities and differences between physical and chemical weathering?
While physical weathering breaks down a rock’s physical structure, chemical weathering alters a rock’s chemical composition . Physical weathering works with mechanical forces, such as friction and impact, while chemical weathering takes place at the molecular level with the exchange of ions and cations.
What are the two types of weathering?
Weathering is often divided into the processes of mechanical weathering and chemical weathering . Biological weathering, in which living or once-living organisms contribute to weathering, can be a part of both processes.
What are the two types of weathering and how are they different?
There are two types of weathering: mechanical and chemical . Mechanical weathering is the disintegration of rock into smaller and smaller fragments. Frost action is an effective form of mechanical weathering. ... Exfoliation is a form of mechanical weathering in which curved plates of rock are stripped from rock below.
