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- 1. Multiple ChoiceThe organic material in soil is ...humusbedrockfertilizerfeldspar
- 2. Multiple ChoiceThe texture of a soil is determined by the soil particles'shapemasssizechemical makeup
- 3. Multiple ChoiceRusting is caused by ...carbonationoxidationhydrolysisnitric acid
- 4. Multiple ChoiceSoil begins to form when the process of ______________ breaks down parent rock.weatheringsoil horizonstopographydeposition
- 5. Multiple ChoiceA distinct layer of soil is a ...soil horizonsoil profilehumustopography
- 6. Multiple ChoiceThe C horizon contains ...humusclay and little to no humuspartially weathered parent rock
- 7. Multiple ChoiceSoil particles are classified as ...parent rock, humus and bacteriasand, silt and clayA horizon, B horizon and C horizonigneous, sedimentary and metamorphic
- 8. Multiple ChoiceWhy are the top layers of soil darker in color than the lower layers?they contain less organic matterthey contain more organic matterthe parent rockthe pore space
- 9. Multiple ChoiceThe process by which rock is broken down as a result of a chemical reaction:chemical weatheringmechanical weatheringphysical weatheringdifferential weathering
- 10. Multiple ChoiceWhat is soil conservation?The dark, organic material formed in soil from the decayed remains of plants & animals.The layer of rock beneath the soil.a method to maintain the fertility of the soil by protecting the soil from erosion and nutrient loss.A loose mixture of rock fragments, organic material, water, & air that can support vegetation.
- 11. Multiple ChoiceWhat is bedrock?The dark, organic material formed in soil from the decayed remains of plants & animals.The solid layer of rock beneath the soil.a method to maintain the fertility of the soil by protecting the soil from erosion and nutrient loss.A loose mixture of rock fragments, organic material, water, & air that can support vegetation.
- 12. Multiple ChoiceWhat is it called when wind blows sand against exposed rock, eventually wearing away the rock’s surface?erosionabrasionchemical weatheringoxidation
- 13. Multiple ChoiceWhich soil particle is largest in size?claysandrocksilt
- 14. Multiple ChoiceWhich soil particle is smallest in size?sandsiltclayhumus
- 15. Multiple ChoiceWhich soil horizon is generally called "subsoil"?Organic/LitterA horizonB horizonC horizon
- 16. Multiple Choice
What most likely happens to soil when crops are not rotated from year to year?The soil nutrients are depletedThe soil fertility increasesThe soil becomes more porousThe soil erodes less rapidly - 17. Multiple ChoiceSoil will pack down over time which decreases the ability of the soil to hold water. Which animals would best help the soil hold water?earthworms making tunnels under the surfacecattle making depressions with their hooveshorses making trenches when they gallopsheep pulling up plants by their roots
- 18. Multiple ChoiceExcess plowing removed the grass from the Great Plains and exposed soil. What effect did this have when a drought struck the Great Plains during the 1930s?It had no effectIt increased the soil's fertility.It helped to cause the Dust Bowl.It prevented sod from developing.
- 19. Multiple ChoiceSoil formation begins with the weathering of ...litterbedrockthe A horizonhumus
- 20. Multiple ChoiceSoil that is rich in humus has highfertility.water content.sand content.clay content.
- 21. Multiple ChoiceThe practice of plowing fields along the curves of a slope is called ...drought plowingcontour plowingno-till plowingsod plowing
- 22. Multiple ChoiceIn conservation plowing, why are dead weeds and stalks of the previous year's crop left in the ground?To keep the soil from becoming too fertile.To reduce the amount of seed needed for the next year's crop.To retain moisture and hold the soil in place.To keep more organisms out of the soil.
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