The water source in Town X is contaminated with hazardous materials during a train derailment. Town X residents are grouped into
low, medium, and high exposure, based on residential proximity to the spill, and then followed for 10years to determine if any illnesses occur. What type of study is this?
The toxicity study describes the dose, nature, incidence, severity and the mechanisms of the toxic effects that damage our organism, in this case in the water of the X people, this study establishes the magnitude of the damage in exposure to living organisms.
Permeability id a scientific index of the soil to have air and water pass through the soil pore and spaces. As clay soils have a fine texture, with loamy soils moderately textured and sandy soils coarsely textured thus permeability changes from slow to rapid.
As sandy soil is highly permeable i.e 5.0 cm per hour and clay soils having the least i.e 0.05 permeability. Loamy soil is composed of sand, silt, and a smaller amount of clay.
From an agricultural perspective, the soil permeability depends upon the percentage of the see-page and the chemical makeup of the soil. Thus crops can grow more easily this type of soil as the particle size is minute and fine.
