A great flood made by God.
There's three answers that are correct:
- food shortages
- inadequate health care
- unemployment
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!
We cant see the picture sorry
Some countries trash rivers which sometimes can end in the ocean because they are connected.
