EARTH SCIENCE - Water Quality QUESTION 1 ________ water has chemistry that resul

Question

EARTH SCIENCE - Water Quality

QUESTION 1

________ water has chemistry that results from the weathering of rocks.

QUESTION 2

________ are human-produced compounds used to control unwanted weeds and insected.

QUESTION 3

________ are chemicals or constituents that make the water undesireable for certain uses, such as drinking. The chemicals usually results from human activities.

QUESTION 4

________ include chemicals such as calcium, magnesium, sodium, and chloride.

QUESTION 5

________ include chemicals such as pharmaceuticals, personal care products, and endocrine disruptors.

QUESTION 6

________ contaminants include living organisms such as bacteria, protozoans, and algae.

QUESTION 7

Which Federal agency is responsible for setting drinking water standards?

U.S. Geological Survey

U.S. Environmental Protection Agency

U.S. Department of Agriculture

Your professor

QUESTION 8

________ was the most commonly detected pesticide in lakes and streams in Orange County, Florida.

QUESTION 9

________ include arsenic, chromium, lead, and mercury.

QUESTION 10

Nitrogen and phosphorus compounds are called ________ because they cause excessive growth of algae and bacteria in water. Their source is usually fertilizers, sewage, or animal wastes.

U.S. Geological Survey

U.S. Environmental Protection Agency

U.S. Department of Agriculture

Your professor

Explanation / Answer

1. Natural water has chemistry that results from the weathering of rocks.

Reason: Natural water includes rainwater, underground water etc and essentially contains dissolved ions, gases and minerals which are mainly derived from the weathering of the rocks as the water interacts with the atmosphere, living organisms qnd the minerals in a rock while making its way through the Earth's surface.

2. Pesticides are human -produced used to control unwanted weeds and insects.

Reason : Chemical substances produced by humans mainly used to control unwanted pests, insects or weeds are known as pesticides.

3. Contaminants are chemicals or constituents that make the water undesirable for certain uses such as drinking. The chemicals usually results from.human activities.

Reason : A poisonous chemical substance or a polluting substance which makes water unfit for drinking is known as contaminant.

4. Major ions include chemicals such as calcium, magnesium, chloride amd sodium.

Reson: Chemicals such as sodium, calcium, magnesium and chloride are the most abundant cations present in water and which are present in water in high concentrations. Thus they are known as major ions.

5. Emerging contaminants include chemicals such qs pharmaceuticals, personal care products and endocrine disruptors.

Reason : Chemicals which are found to have been present in global drinking water supplies but in trace amounts, thus causing unknown harm to human health(not yet known) are known as emerging contaminants and these include herbicide, personal care products, pesticides, pharmaceuticals etc.

6. Microbiological contaminants include living organisms such as bacteria, protozoans and algae.

Reason : Contamination of water resulting from pathogens such as bacteria, protozoans and algae is known as microbiological contamination and the pathogens are known as microbiological contaminents.

7. U.S. Environmental Protection Agency (EPA) is responsible for setting drinking water standards.

Reason : In United States, the U.S. EPA is entrusted with the duty of setting their drinking water standards

8. Atrazine was the most commonly detected pesticide in lakes and streams of Orange county, Florida.

Reason : Atrazine is mainly a herbicide which is used to kill weeds and it is one of the most commonly used pesticide in the world. So it is the most commonly detected pesticides in the Lakes and streams of orange coumty, Florida.

9. Trace metals include arsenic, chromium, lead and mercury.

Reason : Metals like arsenic, chromium, lead and mercury are mostly present in rare quantities (<0.01%) in water and hence they are known as trace metals.

10. Nitrogen and phosphorus compounds are called Nutrients because they cause excessive growth of algae and bacteria in water. Their source is usually fertilizers, sewage or animal wastes.

Reason: Nitrogen and phosphorus are the primary nutrients present in water which helps in the excessive growth of algae and bacteria that in turn serves as food and provides shelter for fishes and other smaller organisms in water.

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