I attached a picture of the layers of the earth. They are the:
Crust (<em>which isn't really the interior</em>)
Mantle
Outer Core
Inner Core
Those geographic helped to protect the Roman Empire.
The building of the dam was proposed by Sun-Yat Sen, who is the father of modern China, to protect the river communities from floods.

The angles of a triangle always need to add up to 180 degrees.



190 is greater than 180, not equal, so these angles will not form a triangle.