Erosion
water, wind, waves, and gravity
acids work together to break it down
Usually it is erosion by natural elements (wind, rain, excessive water), or chemicals (natural chemicals will break down all elements in a matter of time).
Digestion
Usually it is erosion by natural elements (wind, rain, excessive water), or chemicals (natural chemicals will break down all elements in a matter of time).
The underlying force of all agents of erosion is the energy from natural processes such as water flow, wind, ice, and gravity. These forces work to break down and transport rock and sediment from one place to another, shaping the Earth's surface over time.
Acids such as hydrochloric acid can be used to break down rocks by dissolving the minerals in the rock. However, this process can be slow and may not work on all types of rocks. It is important to handle acids carefully as they can be hazardous.
The four natural agents of erosion are water (rivers, waves), wind, ice (glaciers), and gravity. These agents work to break down and transport materials on the Earth's surface, shaping the landscape over time.
Enzymes are substances that break down food into smaller molecules to aid in digestion. They work by catalyzing chemical reactions that help to break down proteins, carbohydrates, and fats into simpler forms that can be absorbed by the body.
exogenous
I believe it is the liver.
There are lots of tools that can be used to break rock surfaces; generally these are hammers and axes of various sorts. A pneumatic drill would also work.