The beginning of the Precambrian<span> period starts with the formation of Earth about 4.5 billion years ago and ends at the first sign of complex life about 540 million years ago. Though the </span>Precambrian<span> Period is often referred to as a period, it's actually the only supereon, which means that it spans multiple eons. The Precambrian is known as the geologic era. The Precambrian is the 1st era. hope that helped</span>
Answer:
https://www.history.com/topics/cold-war/cold-war-history
Explanation:
Answer:
Explanation:
Acid rain is a kind of rain or precipitation that contains high concentration of harmful acidic pollutants mainly nitrogen oxide and the sulfur dioxide which is released into the atmosphere that reach the earth's surface. It is caused by burning of fossil fuels and other industrial wastes released into the atmosphere that reach with rain and turns the precipitation acidic . The marbles of Taj Mahal is also getting adversely affected due to acid rain.
Acid rain is associated with the Part of USA and Canada for two reasons -natural causes such as volcanic eruption,wildfires and lightning:man made causes such as coal plants and Air pollution from automobiles . An average pH of 4-5.is usually found there (5.6 is normal for atmosphere) .
Answer:
4) The rate of species extinction is lower on the small island than on the large island.
Explanation:
The theory of island biogeography suggested that because of the size and links to the mainland. Fewer species that are not from the island will invade because the distance from the mainland is greater. The threat of extinction due to this is low. The small island also has a lower capacity for different species due to limited resources. This would mean that there are simply fewer species to go extinct.
