Answer:
Horizons to be protected in order to conserve soil
Explanation:
The soil was formed over thousands of years.
Soil formation takes place in the following ways:
* Large stones are broken into smaller ones by the constant action of wind and rain.
* It takes many years for these rocks to break down into smaller rocks.
* Rocks are disturbed mainly by two types of weathering – physical weathering and chemical weathering.
* A series of natural forces, called agents, work to break down the parent rock into tiny particles of soil.
* These factors include wind, water, solar heat, and plants and animals.
* These pieces further break down into sand and silt and finally into finer particles and the process continues.
* This process is very slow.
* It takes thousands of years to form just a 1 cm layer of soil.
* These fine particles form the top layer of the soil.
* Soil is found in layers that are arranged during soil formation.
* These layers are called horizons, the sequence of layers is the soil profile.
* Soil layers can be easily observed by their color and particle size.
* The main soil layers are topsoil, subsoil and bedrock.
* Each layer has its own properties.