Tanah atau 'Soil'

http://cse.cosm.sc.edu/hses/SoilNSed/soil/frames.htm

Apa yg aku buat kat bawah ni hanyalah ringkasan dari website di atas.

Seterusnya ialah ringkasan yg di'copy' bulat-bulat. Kalau nak yg betul, sila klik kat  link di atas tu.

Happy reading!

SOIL

"Soil is the thin layer of loose or unconsolidated material that covers most of the Earth's land surface."
	Soil is important because: it provides a medium in which plants can take root; the materials found in soil sustain plant growth; and soil also is a natural storage and purification area for water.

 

	SOIL COMPONENTS:	Usefulness of soil
1	Mineral and rock fragments	The mineral fragments provide a medium that plant roots can attach to.  Plants during growth use elements released from mineral fragments, and some of these elements are essential for plant life.
2	Decayed organic material (the term regolith is used when organic matter is absent)	The decayed organic matter, or humus, in soil is a source of nutrients for plants.  Humus also increases the amount of water that soil can retain, and it contributes to the formation of weak acids that enhance chemical weathering of the mineral fragments.
3	Open (or pore) space	The pore spaces between mineral grains and humus fragments contain either air or water, both of which are needed to sustain plant life.  The water in pores contains soluble nutrients that are taken in by plants.  Air in pore space contains oxygen and carbon dioxide. In addition, pore water and air are required for the decay of organic material.  Without pore space soil would be incapable of sustaining plant life.

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