The risks and expense of manned deep-water exploration must be balanced

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Which of the following are guidelines to follow for obtaining accurate observations

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two