the first plants and anthropodes appear on land approximately about 470 million years ago
Answer:
d. heavy rain or snow
Explanation:
Cumulus clouds -
These are the type of cloud , with flat bases , and they appear to be fluffy , cotton like , puffy , are referred to as the cumulus cloud.
They are usually presents in line or in clusters.
They are present at lower level from the surface of earth , around 2, 000 m .
These cloud usually bring lightning , heavy rain , snow , hail with them .
Hence , from the given statement of the question,
The correct term option is d. heavy rain or snow .
Answer:
In groundwater replenishment system in Orange County, CA, treated domestic sewer is injected into underlying aquifers using injection wells.
False
Explanation:
In the orange country's water treatment system techniques like micro filtration , and ultraviolet ( UV ) , reverse osmosis (RO) disinfection with hydrogen peroxide are used for purification . Generally at the source polluted water is first micro - filtered for the removal of small suspended particles bacteria , protozoa , and harmful virus from water . The water is then filtered via RO , which removes salts , pesticides , viruses and most organic compounds are passed in the presence of the forced water via thin plastic membrane , and in the final stage , the water is treated with hydrogen peroxide and UV light as a precautionary measure.
