This week in science our class was looking at the water quality indicators temperature, turbidity, and fecal coliform. With temperature it affects the amount of dissolved oxygen in the water cold water can hold more oxygen when warm holds less of it. A trend was plants using dissolved oxygen to grow and plants making dissolved oxygen by photosynthesis. Temperature can change the organisms that live there because some organisms need certain temperature to live. Thermal pollution is when water different from the water already there is added. Scientists test water quality by taking the temperature in two different spots and if the difference is big something is wrong.
Turbidity is how clear or murky the water is. Turbid water is caused by clay, silt, microbes, and organic and inorganic materials suspended in water making it not as clear. It is important to measure the turbidity because it stops sunlight from getting in the water so it will heat up and less dissolved oxygen can be held in warm water than cold water. It will also change the organisms that live there because some organisms need different temperature water to live.
Fecal coliform is measured to find the health of a river because when the amount fecal coliform is high the chances are higher for harmful microbes to be present. Fecal coliform can end up in a river by untreated sewage discharge. Humans have a role in altering temperature, turbidity, and the amount of fecal coliform in the water. The role is putting in less inorganic materials in the water so the turbidity is affected which affects the temperature. For fecal coliform it is putting less sewage in the water.
A couple of weeks ago in science we were testing water filters that included sand and gravel, a screen, and a paper filter. In class my experience was good. It was good because I got to participate in putting in a new filter into the bottle. With the filters the one I think is the best was the sand and gravel. The reason I thought it was best was that it was coming out super clear a downside to it was the time it took to fill up a cup. The amount of money the filters are together is 2.75. The sand and gravel together costs 1.50, the paper filter costs 0.25, and the screen costs 1.00.
I seen point source and non point source pollution.I saw point source like a chainsaw running on gas, gas was most likely to travel on water/boat from place to place when the chainsaw was running it polluted the air.I have seen other point source like a lawn mower mowing the lawn, a car having really black exhaust coming out of it.The last point source is that I saw someone drop trash on the ground.Moving onto non point source pollution I saw a plastic bag moving around from the wind in a parking lot, a plastic cup on the ground and a plastic bag left on the ground.
How land and water interact
This module my class have been looking at two pictures of different land use.Agriculture and commercial.Commercial land use is like using leaf blowers,lawn mowers,fertilizer,and fuel/oil spills on the road.Leaf blowers/lawn mowers pollute the air unlike fuel on the road it pollutes the water from runoff it gets carried to water eventually.Agriculture is stuff like fertilizer, and tractor exhaust.they pollute water and air.We have also been studying different land uses like industrial, and residential and how it can pollute like smokestacks and taking in water then releasing it when chemicals are in it.We have looked at water quality and stuff related to that like how it looks like when the balance is out of balance.