When Aliens Attack Format:DVD See powerful currents uproot underwater

See powerful currents uproot underwater kelp plants up to 100 feet in length

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When Aliens Attack Format:DVD See powerful currents uproot underwaterWhat if an extra terrestrial force attacked Earth? What might that look like and how will the people of Earth respond? Consulting a cast of world renowned scientists, survival experts and defense experts, National Geographic explores this frightening scenario. Experts reveal what could motivate alien invaders to attack Earth, and speculate on how the attack might play out, the strategy alien invaders might use, and the most effective ways for humans