Page 230 - New Medley 5 Semester 2

AT ONE GO

 Soil is formed by weathering of rocks. It has three layers – Topsoil, Subsoil and Bedrock.
 Removal of topsoil is called soil erosion.
 Wind, water and human activities are main factors of soil erosion.

 Soil can be conserved by afforestation, terrace farming and by constructing dams across rivers.

REMEMBER THESE TERMS

Weathering : Wearing away of rocks
Fertile : Good to grow plants

Barren : That cannot grow plants well
Course of river : The direction in which a river flows

Embankment : A strong wall built along a river to prevent floods

Check Your Study

A. Tick () the correct answers.

1. e removal of topsoil by water or wind is called
(a) Soil erosion (b) Terrace farming

(c) Silting (d) Soil conservation

2. Settling of soil at the bottom of rivers is called

(a) Landslide (b) Silting

(c) Weathering (d) Dumping

3. e soil erosion makes the soil
(a) Fertile (b) Infertile

(c) Productive (d) Polluted

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