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Fill 2 tubes with 25ml of different soil samples…get third sample from another group…
Fill with water to 100ml mark…mix soil and water per instruction handout
Return to seat wait 30 minutes while we take notes
Finish experiment
Soil is the lose covering of rock particles and decaying organic matter(humus)
Results from both physical and chemical weathering
Parent material is the source of the mineral matter in soils
Parent material is important because: It affects the rate
of weathering Chemical
makeup affects the soils fertility
Time-The longer a soil has been forming the thicker it is.
As a soil gets older other characteristics affect the soil more than the parent material
Climate has the greatest affect on soil formation
Variations in temperature and precipitation affect the rate, depth and type of weathering
Plants are the main source of organic matter
Plants release nutrients when they decay. Adds to the soils fertility
Steep slopes have higher erosion. Little water can soak in. Soils are thin on steep slopes
Soils are composed of particles that can be sand, silt or clay sized.
Based on the soils % composition of each type of particle that determines the soils texture
A soil profile is the vertical sequence of soil layers
Soil horizons are the distinct layers in a profile The upper layers
contain more organic material, the bottom layers contain more parent material