→ Formation Of Soil 12/4/15 →学習を始める /ダウンロードMP3フラッシュカード

学び始める

質問		答え
a mixture of sand, silt, soil, clay, rock and humus (plant and animal remains) 学び始める		soil
when forces on Earth breaks rocks apart or wear rock away 学び始める		weathering
the uppermost 5 to 20 cm of soil with a high concentration of organic matter and microorganisms where almost all of the biological activity in soil takes place 学び始める		topsoil
easily broken down by biological activity, especially bacteria in the soil 学び始める		biodegradable
to break down into smaller, more basic parts 学び始める		decompose

Formation of Soil 12/4/15