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Inessa05 [86]
3 years ago
13

4. Which of the following is a chemical change?

Geography
1 answer:
Andrews [41]3 years ago
8 0

Answer:

Rotting of food

Explanation:

Enzymatic reaction causes molecules to change when rotting, therefore, rotting is a chemical reaction.

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Which country is only 10% of the land fertile?
Dmitry_Shevchenko [17]

Answer:

Russia

Only over 7% of the land is fertile

6 0
3 years ago
Describe the effect of untreated wastewater on the chemical, physical and biological quality of urban streams or rivers.
aleksklad [387]

Answer:

<u>Waste water is any water that is affected by human use and is combination of all domestic, industrial and agricultural stuff</u>s.

Explanation:

  • It can be also called as the stormwater or surface runoff, or sewer infiltration. This type of water can include the domestic wastes involved in households like toilet flushes, dishwashers, washing machines, and detergents. This type of water in developing countries if often treated with septic tanks, drain fields, and onsite sewage systems.
  • Chemical or physical pollutants include heavy metals, organic and inorganic soluble matter such as urea, gases as hydrogen sulfide, various oxides and toxins of pesticides and methane.
  • Use of micropollutants like plastics, and thermal pollutants like heat energies derived from the power station and industrial manufactures. Certain biological sources of pollutants like Bacteria, Virus, and Protozoa, and parasites like organisms.
  • It can include parasitic like insects, arthropods, and others that reduce the biological oxygen capacity of the freshwater stream and decline in the fish population due to the nutrification of water and contaminants due to the wastewaters.
3 0
3 years ago
What is the rooftop of the world​
weeeeeb [17]
What’s the rooftop to the world



Answer: The Roof of the World or Top of the World is a metaphoric description of the high region in the world, also known as High Asia. The term usually refers to the mountainous interior of Asia, including the Pamirs, the Himalayas, the Tibet, the Tian Shan, and the Altai Mountains.




Have a good day;)
7 0
4 years ago
Read 2 more answers
hich of the following is associated with these names deserts such as the Sahara or the Arabian Desert?Group of answer choicessub
tiny-mole [99]

Answer:

subtropical high pressure

Explanation:

Many desert areas are caused by subtropical high pressures. Such areas are consistently warm, dry and also sunny. And are the Arabian desert in the middle east and in Africa, the Sahara desert. It is also called the horse latitude and have it's latitudes between 30 and 35 degree in the north and south. Rainfall is supposed and winds is variable with calm winds sometimes.

6 0
3 years ago
What is the main difference between airports of the early 1920s and international airports of the 1930s?
Oxana [17]
Thank you for posting your question here at brainly. Below are the choices that can be found elsewhere. The answer is A. 

<span>A. Airports in the early 1920s catered to municipal and regional travel, while airports in the 1930s served as hubs for travel between countries.
B. Airports in the early 1920s had larger runways and airport space, while airports of the 1930s had smaller, more efficient layouts.
C. Airports in the early 1920s catered to travel between countries, while airports in the 1930s served as hubs for regional and municipal travel.
D. Airports in the early 1920s were located in West Coast cities, while airports in the 1930s were located in East Coast cities. </span>
4 0
4 years ago
Read 2 more answers
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