EXAM 1 pretest

EXAM 1 pretest - AGRO 301 2/8/08 Pre Test EXAM I Why are...

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AGRO 301 2/8/08 Pre Test EXAM I 1.) Why are soils crucial to life on earth? 2.) What are five functions of soils in our ecosystem? 3.) Essential Elements that are used in relatively large amounts are called ________. 4.) What is Hydroponics? 5.) What is Humus? (and what color?) 6.) What is and where is the lithosphere, atmosphere, hydrosphere, pedosphere and biosphere? 7.) __________ is an unconsolidated layer that varies in thickness from virtually nonexistent in some places to tens of meters in other places. 8.) __________ is where the underlying rock has weathered in place to the degree that it is loose enough to be dug with a spade. 9.) What is the difference between a Soil Profile and a Soil Horizon and a Soil Pit? 10.) The plow layer is the upper __ cm to __ cm of the soil. 11.) What are the spaces between the solid material in a soil called? 12.) A sand is __mm to __mm 13.) A silt is __mm to __mm 14.) A clay is __mm to __mm 15.) What is the soil structure? 16.)
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EXAM 1 pretest - AGRO 301 2/8/08 Pre Test EXAM I Why are...

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