Chemical
By weathering either by physical or chemical weathering.
It is water weathering
Hail. when it melts, water can damage the rock.
Mechanical weathering is a process which physically changes the appearance of a rock or structure. Chemical weathering is a process which changes the chemical composition of a rock or structure.
it just goes down because of weathering
The process that changes the characteristics of a rock is called metamorphism. This involves changes in temperature, pressure, and the presence of chemically active fluids, which can alter the mineral composition and texture of the rock. Metamorphism typically occurs deep within the Earth's crust.
Chemical weathering
Chemical weathering changes the composition of a rock by breaking down minerals through chemical reactions with water, oxygen, acids, or other substances. This process can alter the rock's mineral composition, leading to the formation of new minerals or the dissolution of certain minerals.
Water is the substance that has the greatest effect on the rate of weathering of rock. Water can seep into cracks in rock, freeze and expand, causing the rock to break apart. Water can also chemically react with minerals in the rock, leading to chemical weathering.
Chemical weathering
Probably weathering and/or erosion.
Chemical Weathering