Use of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following processes is most likely to help reduce nitrate pollution? Group of answer choices A. adding methanogens to the soil B. adding nitrifying bacteria to the soil C. adding denitrifying bacteria to the soil D. using ammonia instead of nitrate as a fertilizer

What is the main problem with using desalination to increase water supplies?  Group of answer choices A it is very expensive B communities tend to be located too far from water supplies C supplies are usually contaminated with pesticides D there are few available sources

... Bacteria that grew in the bottom of nutrient broth tube is: a. Anaerobic A b. Flocculent c. Pellicle d. Sediment Reply...

fertilizers are necessary if the soil lacks one of the following nutrients: a. calcium, carbon, potassium b. nitrogen phosphorus, potassium c. nitrogen, phosphorus, magnesium d. nitrogen, calcium, magnesium e. phosphorus, potassium, magnesium

When mineral nutrients are applied to the soil, which of the following may occur?Group of answer choices a. Taken in by the plant b. Leached below the root zone c. Tied up to colloids in the soil d) All of the above

Pesticides vary in terms of their persistence in soils. Give three possible reasons for the existence of such variation.

Name three human activities that can promote soil erosion.Describe several farming techniques (such as terracing andno-till farming) that can help reduce the risk of erosion.

The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Which of the following is not an abiotic factor that affects plants being used in crop rotation?    a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentration

Below you are provided with two scenarios of how excess nutrients can enter water systems. For each scenario, water must begin in the atmosphere, as a gas. Using a minimum of 3 stages of the water cycle, complete the process to illustrate each of the scenarios. It is recommended to write the steps out chronologically as well. 1. How do fertilizers or pesticides placed on farmland infiltrate the soil and the aquifer, in relation to the water cycle? 2. Heavy rainfall has the ability to move fertilizers and surface pollutants to other areas, such as the Ocean. Diagram this process using a minimum of 3 water cycle stages, beginning in the atmosphere.

Cation Exchange capacity is: Group of answer choices a. The amount of cations that can be held by a given mass of soil. b. Affected by soil texture c. Affected by the amount of organic matter/Humus in a soil. d. Affected by the amount of clay in a given soil e) All of the above