What's the approximate length of the panama canal

97 points what types of changes have been made in the united states to protect people from earthquakes? a. communities are no longer located along fault lines. b. building codes ensure that structures can withstand shaking. c. warnings go off when an earthquake is expected, and people evacuate the area. d. barriers have been built to prevent flooding by a tsunami.

How did dynasties end and how did new ones start?

Under the us constitution, some powers belong to the states. choose the power that belongs to the states.