1) The removal of fertile top soil from land by wind or water is called soil a) corrosion b) erosion c) effusion d) diffusion 2) Soil erosion does not occur easily where the land is a) covered with vegetation b) not covered with vegetation c) bare land d) none of the above 3) The main cause of soil erosion is a) reforestation b) plantation c) deforestation d) All of the above 4) The roots of the vegetation growing in the soil bind the particles of top - soil firmly. a) True b) False 5) In the absence of plant roots, the soil becomes tight. a) True b) False

Evaluation Time!

印刷
埋め込み

リーダーボード

表示スタイル

オプション

テンプレートを切り替える

自動保存: を復元しますか?