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Name ______________________ Soil Classification Quiz – Answer Key 1. Describe three patterns that that can be seen from the periodic table of the elements: Grouped by type, listed in order by atomic number, ordered by electron configuration. Atomic radius increases as we move to the bottom left, the melting point decreases as we move away from the center, electronegativity and ionization increases as we move to the upper right 2. Determine the missing properties of the following elements: a. Silicon(Si): Protons = 14, Electrons = _14____ b. Potassium (K): Atomic Number = 19. Mass = _39____, Neutrons = 20 c. Magnesium(Mg): Electrons = 12, Mass = 24, Neutrons = _12____ 3. There are ___92_______ different elements. 4. Describe the purpose of a soil sediment test. Soil texture is a good place to start when looking at soil. Using a sediment test we can understand the soil's texture, and learn more about the possible restrictions on a particular piece of land as well as any advantages. 5. What 3 particles are measured in a sediment test? Sand, silt, clay 6. Describe why it is possible to use water to test a soil sample for different types of sediment. Larger particles will sink faster than smaller particles, when the sediment is agitated, then allowed to settle, the particles will settle into layers. Sand particles will fall first, then silt, then the very small clay particles. 7. What is the purpose of the soil triangle? A textural triangle is used to describe soil texture. 8. Which soil type contains 50% sand, 10% silt, and 40% clay? Sandy clay 9. How does the shape of the soil particles affect the soil quality? Larger round particles provide more pore space for air and water, but are prone to drought. Smaller particles provide more surface area for plant nutrients to “stick”, but have limited pore space. 10. Describe three qualities of healthy, productive soil. Plenty of pore space to hold water and air and allow root growth. Ample surface area for plant nutrients to attach. Organic matter to provide a consistent supply of nutrients. No chemical residue built up or accumulated in the soil.