Soil has ____ main ingredients: ____ matter consist of the ____ of rocks that have been ____ down by ____ and erosion; it includes ____, sand, silt and clay. Air contains ____ and nitrogen and encourages ____ organisms in the ____. ____ binds soil particles and contains dissolved ____ that plants ____. ____ organisms include ____, wood lice and slugs, as well as ____ organisms like bacteria and ____. ____ is the dark, partly decayed ____ matter produced from the remains of ____ creatures and plants ) broken down and ____ in the soil by ____ organisms.) Soil is influenced by: ____ influences temperatures and ____ that cause ____. ____ climates experience ____ weathering, ____ climates experience ____ thaw. Parent material like ____ weathers very ____, while ____ weathers and forms soil ____. ____ based soils are more ____. ____ like deciduous ____ provide rich ____ and nutrients to ____. ____ organisms break ____ plants and animals while ____ break ____ and ____ the soil, allowing water and ____ into the soil. Upland landscapes are often ____ and wet with ____ soils, few plants and ____ and little ____. ____ landscapes are often ____ and well ____. They have plentiful ____ and plant life and ____ humus. Time is very ____ as the longer rock is ____ to ____ the more it is broken ____. ____ can make soil more ____ by improving drainage and ____ and by adding ____. (The ____). They can make soil ____ fertile by ____ using it and by removing ____. (____, over-cropping, over-____)

Soil

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