Vocabulary

Soil=contains weathered rocks (Sand , Silt , Clay), organic matter, air and water.

Organic matter= descomposin plant and animals materials found in top soil.

Soil composition= The ingredients that make up a sample soil.

Nutrients= essencial elements required by and organism to grow an reproduce.

Descompose= break down of plants, animal, etc. Into soil.

Weathering= breakup of rocks cause by chemical and mechanical processes.

pieces of weathered rock= sand, silt, clay.

Sand= largestparticles

Silt= medium particles

Clay= small particles

Soil layer= organic, top soil, sub soil, parent material bedrock.

Top soil= weathered rocks( sand, silt, clay) oraganic matter, air and water.

Sub soil= Some chemical found in top soil, not much organic matter.

Parent material= slight broken up bedrock, no plant root, very little organic matter.

Bedrock= hard rock.

Texture= how soil feels.

Grainy= large pieces, sand like

Silky= medium pieces, silt like.

Sticky=small piece, clay like.

Color= chocolate brown, reddish brown, yellowish brown, grayish brown.

Consistence= how easly soil breaks apart.

Loose= soil breaks apart when held.

Friable= breaks apart with small amount of pressure from one finger.

Firmm= breaks apart with a lot of pressure from two fingers.