A. Animals exhale carbon dioxide into the air
Answer:
The Sirena Deep, which lies 124 miles (200 kilometers) to the east of Challenger Deep, is a bruising 35,462 feet deep (10,809 m). By comparison, Mount Everest stands at 29,026 feet (8,848 m) above sea level, meaning the deepest part of the Mariana Trench is 7,044 feet (2,147 m) deeper than Everest is tall.
Nubia rivaled Egypt for control over land.
Explanation:
Egypt and Nubia were two ancient civilizations that were neighboring each other. Egypt was located in the lower flow of the Nile River, while Nubia was located in the middle flow of the Nile River. At one point, both civilizations were strong and well developed, and while there was lot of collaboration between the two, there were also tensions. The tensions mainly came because of the rivalry over the trade routs and the land which both needed, especially Egypt.
- The majority of the trade from sub-Saharan Africa was going through Nubia, and the Nubians had set some taxes on the trade goods so that they make more wealth.
- The Egyptians didn't fancied that fact that they were paying taxes to Nubia, and they wanted to get hold onto the trade routes and control them themselves, thus they wanted the land for themselves.
- Over time, the rivalry over the trade routes and the demand for new land escalated and Egypt and Nubia got into a conflict, with the Egyptians being the victorious side and making a monopoly when it came to trade between sub-Saharan Africa and North Africa.
- The new land was desired in big part because the Nile River provided lot of fertile land for large scale agriculture, and with the growing population more and more food was needed.
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The depth below Earth's surface at which the boundary between Earth's
outer core and stiffer mantle is located is 3. 2900 kilometers. This is
the location where the outer core that covers our planet ends and meets
its mantle that can be found within the Earth and is stiffer than the
very center of the planet which is made of iron.
