Formation of Minerals and Soil

Science — Second Preparatory

Applications and examples

Comparison aspect	Main idea	Keywords
Experiment 1: separating the parts of soil.	Put a sample of soil in a bottle full of water close it shake it well and let it settle. Sand settles first within about a minute then silt after several hours then clay which takes days to settle. Organic matter floats on the surface	samplebottlefullwater
Experiment 2: formation of minerals by evaporation.	Dissolve some table salt in a cup of warm water and leave it in an open place until the water evaporates. Cube-shaped salt crystals appear on the sides and bottom of the cup. This is an example of a mineral forming by evaporation	Dissolvesometablesalt
Application in farming	when desert land is reclaimed organic fertiliser is added to the sand because it improves water retention and increases the fertility of the soil	desertlandreclaimedorganic

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