NO Soil – minerals – living dynamic resource Foundation for every living thing. Natural resource that needs to be protected Dirt is out of place soil Are dirt and soil the same?
Rocks • Minerals • Organic Matter • Dead animals • Decaying plants How is soil formed?
45% mineral matter 25% Water 25% air 5% organic matter Soil is made up of
Soil Profile – topsoil, subsoil & parent material (bedrock) • Can be less than and inch – over 2’ • Color, structure, texture, amount of gravel and organic matter • Also called soil horizons Soil Layers
Soil’s living organisms Roots, fungi, bacteria and small animals Plants thrive in this layer Wind and water can wash away this layer (erosion) Take over 500 years to replace 1 inch of topsoil. First layer- top soil
Holds water Some organisms but less fertile than topsoil More clay Deeper tree roots Earthworms Subsoil
Less living matter than the other 2 layers What the other 2 layers are formed from Ex. – rock left over from the glaciers or organic matter deposited from water. Parent material
Sand – • Largest of the particles • Gritty, heavy • Water and air can readily move through it. • Basketball Soil Textures
Silt • Smooth like flour • Keep the soil rich and smooth • softball Soil Texture
Clay • Wet – sticky, greasy • Dry – hard like a rock • Marble Soil Texture