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Practice Exam 1 - Name First Exam Agronomy 310 1(16 points...

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Name _________________________________ First Exam Agronomy 310 1. (16 points). Matching. Use each answer only once. _____alluvium a. marble _____colluvium b. wind deposited _____loess c. basalt _____till d. deposited by water _____sedimentary rock e. weathers to allophane _____volcanic ash f. sandstone _____metamorphic rock g. rhyollite _____mafic extrusive rock h. transported by gravity i. deposited by glaciers j. gabbro 2. (8 points) Rank the following soil minerals from least chemically active to the most chemically active: kaolinite, smectite, quartz, illite (hydrous mica) 3. (4 points) Of the minerals listed in question 2, which one would you expect to be dominant in the udic (humid) moisture regime? 4. (12 points) A soil contains 18% gravel, 40% sand, and 26% clay. a. What is the percentage of silt?. b. What is the correct complete textural class? 5. (8 points) Name the components of soil and state what soils provide for plants as a medium of growth. 6. (10 points) Give two names of landforms that are formed by rivers and streams. If both occurred on the same river, which would be the oldest?
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