It is a form of mechanical weathering.
A molecule of water is formed.
Water hyacinths can deplete the oxygen from the water and kill other animals and plants.
I would consider tiny pieces of rock carried by water to be sediment. Sediment is generally clay or sand particles, but any type of rock ground into fine particles can be carried by water. This may include igneous-type rocks (those that come from around volcanoes and the bottom of the ocean).
physical
Mechanical Weathering.
Abrasion
For a fact abrasion is weathering it is machanical weathering
abrasion is a type of erosion which takes place when the water rubs against the sea bed eroading it.
Biological weathering takes place in moderate temperatures. Abrasion weathering is caused by moving water or wind. That can happen in moderate temperatures.
abrasion
water erosion is a type of weathering caused by water.
water
Abrasion
The agents of erosion are wind, water, ice and gravity. Erosion is responsible for moving material from one place to another place. Weathering is the breaking or dissolution of rock into smaller particles, and can occur because of frost wedging, acidic rainfall, wind particle abrasion, animal and plant activity, and a number of other causes. Smaller rock particles are more easily eroded.
A dam is a structure which controls the amount of water flowing. Silt build up is a type of problem many dams face. Silt is a type of sediment which builds up around the dam, as all water contains some form of silt or debris. Some problems caused by silt build up are erosion of dam parts, abrasion to dam materials, and damage to the dam turbines.
Abrasion
They are destructive because it breaks down the river by wind, water, and ice abrasion a mechanical/physical type of weathering.