Mountains don't directly turn into soil. Instead, they are broken down over a long period of time by a process called weathering. Here's a breakdown of how it happens:

1. Physical Weathering:

* Frost wedging: Water seeps into cracks in the rock, freezes, expands, and widens the cracks.

* Thermal expansion and contraction: Rocks expand when heated and contract when cooled. This repeated expansion and contraction can cause rocks to break apart.

* Abrasion: Wind, water, and ice carry sediment (like sand or rocks) that can grind against rocks and wear them down.

2. Chemical Weathering:

* Oxidation: Oxygen reacts with minerals in rocks, causing them to break down.

* Carbonation: Carbon dioxide in the air dissolves in water to form carbonic acid, which reacts with rocks like limestone.

* Hydrolysis: Water reacts with minerals in rocks to form new minerals that are often weaker and easier to break down.

3. Biological Weathering:

* Plant roots: As plant roots grow, they can force their way into cracks in rocks and pry them apart.

* Lichens and mosses: These organisms release acids that can dissolve rocks.

* Burrowing animals: Animals like earthworms, gophers, and moles dig tunnels that expose rocks to weathering.

4. Erosion:

* Once rocks are broken down, they are transported by wind, water, and ice to lower elevations. This process is called erosion.

5. Soil Formation:

* Over thousands or even millions of years, the weathered rock fragments, along with organic matter from plants and animals, accumulate and form soil.

In summary:

Mountains are broken down by physical, chemical, and biological weathering. The weathered rock fragments are transported by erosion and eventually accumulate with organic matter to form soil. This is a long and ongoing process that shapes the landscape and creates the foundation for plant life.