A wave will travel only as long as it has energy to carry. The energy makes a wave travel and it will stop traveling as soon as the energy is dissipated.
The main U.S. goal in the Southeast Asia War was to protect South Vietnam -- initially from a local communist insurgency and later from conquest by communist North Vietnam. The U.S. also hoped to prevent the spread of communism to other nearby countries. ... The U.S. gave France military assistance in fighting insurgents
A solar system is a group of planets that orbit around a sun (giant burning star) that has enough gravity to keep the planets from crashing into each other, as well as stop them from drifting away
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