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Recently Asked soils and ecosystems Questions
Expert help when you need it- Q1:1. Explain why bulk density is higher in coarse-textured (sandy) soils compared to fine-textured (silt, clay) soils. If it helps to include a diagram to support your answer, please do so.See Answer
- Q2:2. ChatGPT is an amazing tool, but has its limitations. Below is the response of ChatG PT to the question "Why do sandy soils have higher bulk densities than clay soils?" Highlight and explain the errors in this ChatGPT response. The differences in particle size and packing characteristics between sandy and clay soils are the primary reasons for the variation in bulk density. Sandy soils have larger particles and looser packing, resulting in more extensive pore spaces and higher bulk density, while clay soils have finer particles and denser packing, leading to less pore space and lower bulk density. These differences in bulk density can have significant implications for soil properties, water retention, and plant growth.See Answer
- Q3:3. Diagram the structure of a water molecule, label the atoms in the molecule, and identify locations of the partial '+' and partial regions. Diagram one water molecule adhering to a soil particle surface and a second molecule cohering to the first. Make sure orientations of these water molecules are correct.See Answer
- Q4:4. Identify and briefly define/describe at least five very important behaviors or properties of water that arise from its polar nature. You should draw on learnings from sections on soil water and soil temperature to answer this question.See Answer
- Q5:5. Why are we interested in characterizing the potential energy status of water at any given point in the soil-plant-atmosphere continuum? Ultimately, what is the driving force or the most significant water potential term along this continuum? Explain.See Answer
- Q6:6. Explain/discuss two real-world implication of water movement in stratified soils (i.e., soil profiles with horizons that have different soil textures and hydraulic conductivities).See Answer
- Q7:AW. 7. Given Darcy's Law describing saturated flow of water in soil: Q = A x Katx . Explain each term in this equation. What is the most important, flow-rate-limiting term in the equation and why? How might you use Darcy's Law to evaluate risk of, for example, contaminant leakage or failure of an earthen dam? 8. Macropores and micropores are defined based on a specific diameter measure, and operationally. Define macropore and micropore both ways. How can you estimate the % macropore space and % micropore space in soil using information in Table 1?See Answer
- Q8:9. Calculate the gravimetric water content (water content by weight, or em) of this soil ing water/g dry soil, or %.See Answer
- Q9:10. Calculate the bulk density (Db) of the sample. Is this a good bulk density? Explain.See Answer
- Q10:11. Calculate the volumetric water content (ev) of the sample in cm³/cm³ or %.See Answer
- Q11:12. Calculate the equivalent depth of water (De) in a 100 cm depth of this soil.See Answer
- Q12: Describe the grading of the North sample from the uniformity coefficient.See Answer
- Q13: In the table below fill in the plastic limit for each soil sample. According to the plastic limits the has a higher clay content. Based on the information above which soil is more cohesive?See Answer
- Q14: Classify South soil sample based on the grading curves you have completed and the scale on the graph. O silty sand poorly graded fine sand well graded fine sand poorly graded coarse sand well graded silty sand well graded gravel sand poorly graded silt O clay poorly graded gravelSee Answer
- Q15: Finally, since you are the head engineer and make all of the final decisions, based on the data and calculations you have completed above, which location are you going to build the Prime Minister's new storage facility, if you are going to build at all? Briefly justify your choice.See Answer
- Q16: Describe which of these soils will be a better draining material (Hint: in order to drain properly, a soil should have good porosity and permeability).See Answer
- Q17: Several questions that will follow involve analyzing and interpreting the particle size distribution curves for the North and South sides of the Prime Minister's residence on the provided blank particle size distribution graph. You must download the particle size distribution graph, plot the sieve data from the North and South sides of the PM's residence ON THE SAME GRAPH. You must also determine the percent of each grain size from your completed curves and record them in the appropriate space below the graph. Once you have completed both of these tasks, upload your COMPLETED graph here. You can upload as an image or document file but please makes sure that both curves are labelled and the text is legible or it will not be graded. Again, you will need these data for other questions in this lab.See Answer
- Q18: Describe the grading of the South sample from the uniformity coefficient. O well graded O uniformSee Answer
- Q19: Classify North soil sample based on the grading curves you have completed and the scale on the graph. O silty sand poorly graded fine sand well graded fine sand poorly graded coarse sand O well graded silty sand well graded silty sand poorly graded silt well graded coarse sand O clay O poorly graded gravelSee Answer
- Q20: You have also obtained some Atterberg Limit data for portions of each of the soil samples. Plot the data on the plasticity chart below. See Answer
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