concept 1: All people are created equal
concept 2: All people have basic rights that cannot be taken away
concept 3: The government gets its power to make decisions and to protect rights from the people
concept 4: When the government does not protect the rights of the people, the people have the right to change or remove the government
The United States entered WWII after the Japanese bombed Pearl Harbor.
The missile launch crisis
Upper Mantle layer is what produces magma that causes sea floor spreading and volcanoes. :)