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used radio waves to help people to explore
radar set pick up echoes that are bounced back from an object
why did humans have to develop technology before they could explore very cold places?
they had to develop technology to survive
how can people control whether they float or sink
float-they breth and fill their lungs
sink-let your air out
what technology is used to control buoyancy
a buoyancy compensator was developed to control buoyancy
how can people survive the water pressure in the deep ocean
to survive water pressure go down in a submersible
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