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4) Melting of ice under skating blades is due to high pressure.
11) The Earth's "N" pole resides in the northern hemisphere
13) Laser coherence is caused by atoms' in-phase emissionWhat's the "answer" here? And why does laser coherence very so much
14) Sound travels much better through solids and liquids than through gasWhat do you mean by better?
16) Reentering spacecraft are heated only by frictinoWhat are the other sources of heating?