Which of the following is the most important force of erosion in deserts?
A. ice B. wind C. water D. plant roots How do plants play an important role in preventing wind erosion? A. Plants make the surrounding soil light and crumbly. B. Plants help make the soil easily transported by wind. C. Plants hold the soil and slow down the effects of wind. D. Plants help the wind create unusual landforms such as ventifacts. Which of the following is a wind-blown large pile of sand? A. erg B. desert C. erosion D. desert varnish Which of the following is a type of fine soil that is deposited by wind? A. erg B. dune C. loess D. ventifact Why are there two specific latitudes on planet Earth that contain desert? A. Wind takes moisture away at these latitudes. B. There is a large amount of rain at these latitudes. C. Tundra is present all year round at these latitudes. D. Freezing temperatures are only found at these latitudes.
What is the definition of water erosion?
Erosion is the group of natural processes, including weathering, dissolution, abrasion, corrosion, and transportation, by which material is worn away from the earth's surface. http://www.thefreedictionary.com/erosion
Which of the following is not one of the external geologic processes driven by energy from the sun?
which of the following is not one of the external geologic processes driven by energy from the sun? answer choices: A. decompostition B. wind erosion C. weathering D. water erosion E. Glacial Erosion
Which of the following is not a means of water erosion?
Which of the following what is not a means of water erotion. Where are the options?
How does soil erosion cause flooding?
They both can cause each other. For example, in a forest with heavy deforestation, the trees are removed and the soil is compacted by machinery. When it rains, the soil cannot cling onto the roots and such to stay in place and the compacted soil cannot absorb the water. During heavy rains the water runs off causing floods and eventually soil erosion.Likewise, soil erosion may lead to flooding as well because without the soil’s ability to absorb water, downstream flooding can occur creating off-site problems.The water in the floods is excess so when the water flows it even takes the soil with them so that's how floods cause soil erosion.
For each substance, estimate the standard deviation σ by using the methods shown in Table 8.11 in section 8.7.?
The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in their drinking water. Samples from the Lake Huron Water Treatment Plant gave the results shown here. Only the range is reported, not the mean (presumably the mean would be the midrange). Chart: Substance / MCLG Range Detected /Allowable MCLG/Origin of substance Chromium / 0.47 to 0.69 / 100/Discharge for steel & pulp mills, natural erosion Selenium / 0 to 0.0014 / 50/Corrosion of household plumbing, leaching from wood preservatives, natural erosion Barium / 0.004 to 0.019 / 2/Disccharge from drilling waste, metal refineries, natural erosion Fluoride / 1.07 to 1.17 / 4.0/natural erosion, water additive, discharge from fertilizer and aluminum factories MCLG = Maximum contaminant level goal (a) For each substance, estimate the standard deviation σ by using the methods shown in Table 8.11 in section 8.7. SEE BELOW (b) Why might an estimate of σ be helpful in planning future water sample testing? Table 8.11 Method 1: Take a Preliminary Sample Take a small preliminary sample and use the sample estimate s in place of σ. This method is the most common, through its logic is somewhat circular (i.e., take a sample to plan a sample). Method 2: Assume Uniform Population Estimate rough upper and lower limits a and b and set σ = (b – a)²/12)½. For example, we might guess the weight of a light-duty truck to range from 1.500 pounds to 3.500 pounds, implying a standard deviation of σ = ((3,500 – 1,500²/12) ½ = 577 pounds. Since a uniform distribution has no central tendency, the actual σ is probably smaller than our guess, so we get larger n than necessary (a conservative result). Method 3: Assume Normal Population Estimate rough upper and lower bounds a and b, and set σ = (b-a)/4. This assumes normality with most of the data within μ + 2σ and μ - 2σ so the range is 4σ. For example, we might guess the weight of a light truck to range from 1,500 pounds to 3,500 pounds, implying σ = (3,500 – 1,500)/4 = 400 pounds. Some books suggest σ – R/6 based on the Empirical Rule, but recent research shows that rule is not conservative enough Method 4: Poisson Arrival In the special case when μ is a Poisson arrival rate, then σ = √μ. For example, if you think the arrival rate is about 20 customer per hour, then you would estimate σ = √20=4.47.
When trees are cut, soil erosion happens. Why?
Two factors like Wind blow and Rain Drops can be controlled by a tree. Trees act like obstacles to wind blow. They slow down the high speed air-blow and mostly interrupt the wind, which prevents soil to be blown up. Again the soil beneath dense trees contains too much of moist as compared to the desert area. This also helps the soil, hard to be blown up by wind. Similarly speed of rain drops, rainfall intensity and runoff are the causes of soil erosion by water. The impact of raindrops will break up the soil and water build-up will create runoff, taking sediment with it. Trees help to scatter and break the speed of rain drops. Inside a deep & dense forest, water reaches the ground after several hours of rainfall. The photo I am sharing is snapped by me during a heavy rainfall of 15 minutes and you can see a single tree is saving the ground even after a long period.A dense forest with much vegetation cover always becomes a barrier to strong wind and heavy raindrops and provide full support to its bottom. There are several artificial methods to eliminate soil erosion but they are much more expensive and not so effective as compared to the vegetation cover. So cutting of trees causes soil erosion.