Answer:
Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form)
Explanation:
Answer:
Explanation:
At the autumnal equinox.
At the equinox. , duration of day and night are equal all over the globe . It happens because sun is just over the equator , going towards the south .
After 6 months of night , day starts breaking in southern hemisphere. For next 6 months there is likely to be day in the south pole.
The sun will be seen near the horizon moving on a circular path all through the day parallel to the horizon without setting.
<span>Movements of tectonic plates create volcanoes along the plate boundaries, which erupt and form mountains.</span>
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.
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