Answer: Sedimentary rock
Explanation:
From google (There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all fossils are preserved in sedimentary rock. Organisms that live in topographically low places (such as lakes or ocean basins) have the best chance of being preserved.)
The four factors which reflected population density is:
Natality rate
Mortality rate
immigration
emigration
Pollution. When there are too many gasses in the atmosphere it contributes to global warming
I think it was the North Sea.
Answer:
Political boundaries are the dividing lines between countries, states, provinces, counties, and cities. These lines, more often called borders, are created by people to separate areas governed by different groups. ... Political boundaries change over time through wars, treaties, and trade