The answer is B. phosphodioxide. It is not a pollutant of fossil fuels.
Answer:
A hot spot
Explanation:
In geology, a hot spot is an area of the Earth’s mantle from which hot plumes rise upward, forming volcanoes on the overlying crust.
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Superposition is the geologic principle which explains why the bottom stratum in a section of rock is the oldest. The word literally means placing one thing on top of another where the lower strata are the older.
Answer:
The role of human systems and political systems in Russia is very complex, Poverty is widespread, living standards square measure low and, typical of a non-developed country, the exportation of natural resources fuels abundant of Russia's economy. Russia is borderline at the best on most developed-country metrics. the country's per capita GDP is $24,451 and these all factors shapes the Russian core.
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Answer: In Medieval Europe, knights pledged loyalty to vassals, who in turn pledged theirs to powerful lords, and serfs labored in the fields.
Explanation:
A rigid hierarchy refers to one where people who are born into a certain position in life, find it quite hard to move from it or rather one where there are different social classes and people had to be classified in one class for the system to work.
The system during medieval times was much like this. Social classes existed that determined a person's worth in society such as the knights, vassals, Lords and Royals. There was also the serfs who were considered the lowest in the hierarchy.
