Memory Game PLSC101 Memory Game 2Online version Lab Group 7 Topics: Soil parts and tillage by cindy s Made up of decaying animal and plant residue degraded by organisms Soils that are formed under grasslands, very good for crop growth. Ridge Tillage Mollisol Light tillage to mix up and move crop residue on the surface. Organic Matter Top layer of soil that is made up of organic matter, water, air and mineral particles Deep tillage to bury residue, followed by shallow tillage to smooth Pore Space Organic component of decomposed leaves and plant material Topsoil Conventional Tillage Humus Mulch Tillage No-Till Conservation Tillage Moldboard Plow Gravitational Water