Did you know that nearly all the soil that exists in the world today was once rocked? Nature has been at work for millions of years weathering and crumbling the rock into the tiny fragments we call soil.
This is done in many ways. Alternate heat and cold cracks off surfaces of rock. Wind-blown sand wears away rock. Glaciers scrape rock surfaces. Running water carrying mud and sand rubs away rock surfaces. Waves beating against a shore pound rock into smaller and smaller pieces. Certain bacteria give off acids that help crumble rocks.
One way to classify soil is according to the size and quantity of the rock particles in it. Sandy soil is composed chiefly of sand. Clay soil has very fine particles and tends to be heavy, cold, and damp. “Loan” is a kind of medium mixture of sand and clay. Stony soil contains a large proportion of rocks or pebbles. “Muck”, or peat soil, has few rock particles and is made up chiefly of decayed vegetation.
The soil in which plants grow is made up of more than rock particles. It is a complex substance that also contains mineral salts, decayed organic material, and living organisms.
The value of soil depends on its power to supply plant foods, air, and water to the roots of plants. If we sterilized soil and killed every living thing in it, the soil would no longer be “fertile”.
But even if soil contained all the necessary plant foods, nothing would grow in it without water to dissolve these foods. Water rises in the soil just as the water rises in a sponge placed in a saucer of water, The rising of this water keeps plants growing even when it does not rain for a long time.
What Are The 4 Types Of Soil?
Soil Is Classified Into Four Types:
1. Sandy soil.
2. Silt Soil.
3. Clay Soil.
4. Loamy Soil.
The surface of the soil is the bottom layer. The second layer is called the organic layer. The third layer is the mineral layer. And the fourth layer is the topsoil. There are five layers of soil that can be found on all land. They are the topsoil, organic layer, mineral layer, sub-soil, and sub-soil. The topsoil is the easiest to make use of since it is the layer that has the most nutrients. The organic layer lies directly under the topsoil. This is where the plants grow and where the roots live. The mineral layer lies directly under the organic layer. This is where all the minerals are added to the soil, which helps the plant grow. The
What are the 3 main types of soil?
Silt, clay, and sand
Sand is a natural material, but what exactly is it? Is it soil? Not if you know the difference between sand and soil. Sand is a granular material that comes from the weathering of rocks. However, it is not soil, since it does not contain organic material. It is made up of particles such as quartz, feldspar, and biotite mica.