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** __Soil__ ** Mr. Terry Science 7 __** SB **__

__** Vocabulary- **__ __**Leaching-**__ The process by which materials from soil are dissolved and carried away by water. __**Humus-**__ The dark-colored part of the soil that is rich is rich in nutrients, such as nitrogen. phosphorus, potassium, and sulfur. __**Topsoil-**__ The topmost layer of the soil, which is dark-colored and rich in humus. __**Fertile-**__ Fertile of soil, containing the nutrients needed for plant growth. __**Compost-​**__ The part of soil composed of dead plant matter.

**__ Questions- __** How do you permeate soil? What is loam? How many different kinds of soil are there? What is Water-holding capacity? Does different soil feel different? What is a soil profile? What is desertification? Where are the biggest landfill sites? How is soil formed? What is soil made from?

**__ Information on soil __** Soil can take thousands of years to form. It can be up to 60 centimeteres thick, or it can only be a few centimeters. Soil feels and looks different depending on its depth. Soil is made of a mixture of weathered rock, organic matter, minereal fragments, water, and air. Desertification is the process in which deserts are formed. Permeate of water, to drain through soil. Loam is a type of soil that is good for plant growth. Water holding capacity is the ability of soil to retain water. Soil profile is the description of the different characteristics of the diferent layers of soil. The biggest landfill site in Canada is the Keele Valley Landfill. It is located in Toronto. There are many different kinds of soil but I couldn't find the exact number. Without soil plant couldn't grow, which means a lot of animals would die. Soil is very important to our envirourment and our world.