When a city becomes too crowded, it can’t provide the resources that the individuals living there need. I didn’t really understand what you were saying, but hope this helps!
Answer:
1.Mercury, Venus, Earth and Mars
2.global warming and climate change; water pollution and ocean acidification; and loss of biodiversity.
3.
A wall stands using gravity. It is constantly being pulled down. Many also place them in ways that they dig into the ground, and almost make a socket just for the wall to be placed, using the land that is there. More and more walls are placed and eventually, they make flooring and a roof.
Hope that helped!
Tectonic plates
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