UNIT 3: ACTIVITIES



DEFINITIONS
1.-Define soil.
2.-Define weathering.
3.-Define horizon.
4.-Define humus.
5.-Define parental material.

COMPLETE THIS TEXT ABOUT THE MAIN FUNCTIONS OF THE SOIL
Soil performs many critical functions in almost any ecosystem (whether a farm, forest, prairie, marsh, or suburban watershed). There are seven general roles that soils play:


a.-serve as engineering media for construction
b.-animals that live in the soil      
c.-growth of all kinds of plants.  
d.-act as a living filter to clean water 
e.-process recycled nutrients                    
f.-absorb, hold, release, alter, and purify       
g.-emitting and absorbing gases

  1. Soils serve as media for __________________________________________
  2. Soils modify the atmosphere by __________________________ (carbon dioxide, methane, water vapor, and the like) and dust.
  3. Soils provide habitat for ____________________________(such as groundhogs /marmotas/, moles /topos/ and mice) to organisms (such as bacteria and fungi), that account for most of the living things on Earth.
  4. Soils ___________________________most of the water in terrestrial systems.
  5. Soils _______________________, including carbon, so that living things can use them over and over again.
  6. Soils _________________________of foundations, roadbeds, dams and buildings, and preserve or destroy artifacts of human endeavors.
  7.  Soils ____________________________before it moves into an aquifer.

LABELLING
Write the name of the horizons or layers:




ORGANISE THE LAYERS IN THE CORRECT ORDER:
1.-The deposit at Earth’s surface from which the soil developed. _________________
2.-Mostly organic matter such as decomposing leaves. This horizon is thin in some soils, thick in others, and not present at all in others. _______________________
3.-Rich in minerals that leached (moved down) from other horizons and accumulated here. ___________________
4.-A mass of rock such as granite, basalt, quartzite, limestone or sandstone that forms the parent material for some soils – if the bedrock is close enough to the surface to weather. This is not soil.  _________________
5.-Mostly minerals from parent material with organic matter incorporated. A good material for plants and other organisms to live. __________________________
6.-Leached of clay, minerals, and organic matter, leaving a concentration of sand and silt particles of quartz or other resistant materials – missing in some soils but often found in older soils and forest soils. __________________

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