Answer:
<em>A. 6,000 years</em>
Explanation:
Original sample N = 60 g
The half life of N/2 is 3000yrs
"""""""""""""""""""N/4 is 6000yrs
N/4 ===> 15 gram
it takes 6000yrs to decrease to 15grams
Answer:
A
Explanation:
Beacause if we lived too close to sun we be burnt
The correct answer is - Greenhouse effect.
The Greenhouse effect is a process in which certain type of gasses in the lower atmosphere manage to trap the heat that is radiated from the surface of the planet.
The gases that are considered to be greenhouse gases are able to perform such a thing, despite being relatively low in amount compared to other gases, because they have much more complex molecular structure.
The molecular structure of this gases enables them to trap the heat, or rather to not allow to leave the atmosphere and return it back toward the surface, thus having huge effect on the climate.
Greenhouse gases are the carbon dioxide, methane, water vapor, nitrous oxide.
Global warming is a slow increase in the overall temperature of the earth's atmosphere generally created by the greenhouse effect. This effect is caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.
Wood bussiness. There a lot of illegal choppers doing wood traffic. It’s a big issue and many towns and peasants fight against them.