Answer:
The feature on the ocean floor at C is called a <u>trench</u>
I know the main one (the one that is used today) is Hinduism
There would be a scarce amount of food so organisms will start dying out. Food webs would get messed up.
The Northern European plain and lowlands of West Siberian Plains have a lot of differences in terms of their characteristics. The only similarity between the two would be the vast complex land that both of these lands have.
I hope this answered your question.
Our planet, Earth appears blue due to the mass amounts of water and lacks on its surface.