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2. Shrink–swell capacity - Wikipedia

   en.wikipedia.org/wiki/Shrink–swell_capacity

   A soil survey should list the coefficient of linear extensibility (COLE) value. [2] Professional soil scientists can also analyze samples of a soil to determine its shrink-swell capacity. [2] Expansive soils will form large cracks, in roughly polygonal shapes, on the surface of the soil during dry periods. [3]

3. Agricultural expansion - Wikipedia

   en.wikipedia.org/wiki/Agricultural_expansion

   Agricultural expansion describes the growth of agricultural land (arable land, pastures, etc.) especially in the 20th and 21st centuries.. The agricultural expansion is often explained as a direct consequence of the global increase in food and energy requirements due to continuing population growth (both which in turn have been attributed to agricultural expansion itself [1] [2]), with an ...

4. Dry grassland - Wikipedia

   en.wikipedia.org/wiki/Dry_grassland

   The lack of nutrients in the soil prevent larger plants and trees to grow, which gives the species in Acredidae a sufficient amount of light to complete their life cycle. This is consistent with the fact that dry grassland is known for specialist invertebrate species, that are not common anywhere else, such as solitary wasps and field cricket ...

5. Frost heaving - Wikipedia

   en.wikipedia.org/wiki/Frost_heaving

   Photograph taken 21 March 2010 in Norwich, Vermont. Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary).

6. Expansive clay - Wikipedia

   en.wikipedia.org/wiki/Expansive_clay

   Expansive clays have an expanding crystal lattice in a 2:1 ratio; however, there are 2:1 non-expansive clays. [2] Mitigation of the effects of expansive clay on structures built in areas with expansive clays is a major challenge in geotechnical engineering. Some areas mitigate foundation cracking by watering around the foundation with a soaker ...

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8. Soil in the United States - Wikipedia

   en.wikipedia.org/wiki/Soil_in_the_United_States

   Soils are the product of climate, organisms and topography, acting on parent (geologic) material over time. Thus the great diversity of geologic materials, geomorphic processes, climatic conditions, biotic assemblages and land surface ages in the United States is responsible for the presence of an enormous variety of mineral and organic soils.

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   www.aol.com/games/play/masque-publishing/hearts

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