Description. With a total area of 2,166,086 square kilometers, Greenland is the world's largest island. The country is located in northern North America, between the Arctic Ocean and the North Atlantic Ocean, and borders Canada to the northeast and Iceland to the northwest.
Answer:
If the duration of life on Earth was on a scale of 20,000 days, the human species would be present in the Earth for approximately 9 days.
Explanation:
We can't be sure about the exactly age of the Earth, but we can base our calculus in a number between 4400 and 4600 million years, because the most accepted researches shows numbers in this span of time. We can take the average of those limits: 4500 million years.
On another hand the presence in the Earth of human species has not a precise date because of the it does not have a precise date for two main reasons, the scientific evidence does not include all the human species that existed on Earth but it is a very incomplete evidence and besides being an evolutionary phenomenon it is not easy to determine from what moment We can consider that a species belongs to the human race or not. In any case, we take the approximate date of the scientific evidence of the existence of human species in an age of 2 million years.
With both numbers we can calculate the proportion in the scale of 20 thousand years throw the following formula:
PHS = 20000 years . 2 million years / 4500 million years = 8.9 years
PHS: Presence of Human Species
Fidel Castro, as he established the one-party, authoritarian state which has been ruling Cuba ever since.
Answer:
<u>Radon </u>in door source of air pollution.
Explanation:
- From all Pollutant and sources found in the interior of the homes like the pet dander and molds, pesticides and asbestos. Radon a chemical element found in homes having an atomic number of 86. It is a radioactive and odorless tasteless natural gas.
- Through the radon is non-reactive elements, it can be oxidized with compounds of fluoride. It has no stable isotopes characterized bt unstable mass. In the mining industry, it caused due to the exposure from the released air.
- Radium-226 is used to produce the radon which is found in uranium ores and phosphate rocks. An estimate of about 2.4 billion curies of radon is released every year into the soil. This pollutant can also be found in water bodies and even in construction sites.
