1) Which soil is best for gardening? a) desert soil b) sandy soil c) farm soil 2) Which soil doesn't hold water, but allows it to pass through? a) sand b) clay c) air 3) What is HUMUS made from? a) The remains of decayed plants and animals b) Chick-Peas c) Cheese 4) Are there minerals in soil? a) yes b) no 5) Which layer is the bottom of the soil profile? a) Topsoil b) subsoil c) Bedrock

SOIL

由
列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?