What new technology was used in world war 1 A. Gas

B. Tanks

C. Machine guns

D. U-boats

E. All of the above

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.

Music the height of a wave or the amount of the wave carries is the amplitude. a. air b. nodes c. speed d. energy

Describe two reasons that cities developed along rivers during the industrial revolution. for full credit, your response must be at least 2 complete sentences.