Answer:
their military involvement in Angola
Explanation:
Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table. It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter. Boiling point: −195.8 °C (−320.4 °F)
Atomic number: 7 has five electrons in its outer shell, so it is trivalent in most compounds. Nitrogen is important for plant growth and can be 'fixed' by lightning or added to soils in fertilisers. A colourless, odourless gas. Nitrogen is important to the chemical industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives.
Explanation:
Pretty sure the answer is D if not its B
Answer:
Most early cities developed in southern Mesopotamia because it had more fertile land.
Explanation:
A is not correct because Mesopotamia was poor in natural resources, it actually had just two primary ones, but those two were the most important at that time.
B is correct because the abundance of fertile land along the Tigris and Euphrates enabled the developement of societies, as the people were able to produce much more food than they needed and used it for trade to obtain other goods.
C is not correct because civilization was only able to develop because of the abundance of fertile land and water.
D is not correct because the natural borders don't provide conditions for the development of civilization, but just make it easier as they eliminate the threat of invasion.
The answer is D. heat flow and the movement of material inside the Earth
That is the only really obvious answer since it's basically talking about plate tectonics.
