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steps how soil formed. 

Hi,

This are the following steps of soil formation:---

  1. Variation in temperature between day and night led to repeated expansion of rocks during the day and contraction, on cooling, during the night. Rocks, thus became brittle and broke down into smaller particles.
  2. Water entered the cracks and crevices (cavities) of the rocks. In winter, water froze into ice and expanded. It exerted pressure on the rock resulting in its break down.
  3. The roots of small plants grew andentered the cracks and enhanced the process of break down.
  4. Many microorganisms and lichens grew on the surface of rocks. They produced acids which dissolved the minerals and helped in further breaking of rocks.
  5. Due to rain and wind, broken pieces of rcks rolled down and hit each other. The rocks progressively broke into smaller particles. Decaying organic material from the plants and animals got mixed with it. The soil, thus formed, became rich in organic matter...!!@@!!
Cheerrzzz.....!!@@!! :-)

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View Full Answer

 When small pieces of rock break off larger ones, they form the basis of all soil. This breaking can occur in several ways: through the action of glaciers pushing rocks along the ground and grinding them against other rocks; through the action of chemicals in water eating away at rocks; through changes in temperature causing water to freeze in rocks and crack them open; through the force of wind throwing sand and pebbles against rocks; and through the movement of plant roots splitting rocks apart. This rocky, ground-up material is called the parent material of the soil. 
When a plant or animal dies, its remains are attacked by bacteria which decompose, or break them down. This decaying matter combines with the parent material and provides the soil with many nutrients to help new plants grow.

Water and air fill in the spaces between the ground-up rock and decaying matter to provide places for tiny insects to live and for plant roots to grow.

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Hi,

 Your friend Rebecca has posted the correct answer.

 Hope it clears.

Cheers!

@Rebecca: very good attempt. Keep it up! You deserve thumbs up from experts.

 

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