In most situations, erosion is a physical process. It occurs when a medium (usually air or water) displaces another substance, changing its physical appearance and/or shape.
One example is a steel plate that has a steady stream of water running or dripping on it. Over time, the water will create a depression in the steel, despite the steel being much harder than the water.
Another example would be wind or rain washing sand from a hill, changing the shape, and eventually even the size, of the hill. The Silver Lake Sand Dunes on the west side of Michigan have been changed dramatically by the wind over the last 140 years, literally burying whole trees and even buildings.
Sometimes the erosion process can contribute to chemical reactions. These reactions are called Erosion Corrosion or Flow Accelerated Corrosion. (Please see the related links below.)
Sanding rust off a bike is a physical change because it does not alter the chemical composition of the rust or the metal underneath. It only changes the physical appearance by removing the rust layer mechanically through abrasion.
Platinum rings acquire a dull satin finish from age and physical wear. Scratches do not actually remove metal from the ring but only displace the metal, so a platinum ring can be polished back to its original appearance without any wear to the ring.
it is a chemical change
Sanding wood is a physical change because it does not alter the chemical composition of the wood. The process of sanding simply removes layers of wood through abrasion, changing its physical appearance and texture without changing its chemical structure. In contrast, a chemical change would involve a transformation at the molecular level, resulting in the formation of new substances with different chemical properties.
Crushing charcoal into powder is a physical change, as it alters the size and shape of the charcoal without changing its chemical composition.
It is a physical process.
Any form of abrasion is a physical process.
The three forms of abrasion are mechanical abrasion, chemical abrasion, and physical abrasion. Mechanical abrasion involves the physical wearing away of a material by friction or impact. Chemical abrasion occurs when a material is worn down through chemical reactions, such as oxidation. Physical abrasion is the erosion of a material due to external forces like wind or water.
it is physical weathering
Sanding rust off a bike is a physical change because it does not alter the chemical composition of the rust or the metal underneath. It only changes the physical appearance by removing the rust layer mechanically through abrasion.
Nope... sanding a table top is a physical change
Platinum rings acquire a dull satin finish from age and physical wear. Scratches do not actually remove metal from the ring but only displace the metal, so a platinum ring can be polished back to its original appearance without any wear to the ring.
A physical change
Physical weathering is caused by mechanical forces such as temperature changes, frost wedging, and abrasion, while chemical weathering involves the breakdown of rock through chemical reactions like oxidation and hydrolysis. Physical weathering does not change the chemical composition of the rock, whereas chemical weathering alters the mineral structure.
Physical change of the paint, not the door.
it is a chemical change
Sanding wood is a physical change because it does not alter the chemical composition of the wood. The process of sanding simply removes layers of wood through abrasion, changing its physical appearance and texture without changing its chemical structure. In contrast, a chemical change would involve a transformation at the molecular level, resulting in the formation of new substances with different chemical properties.