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Fill the blanks using the below options:
 
CompressionAmplitudeRarefaction
UltrasoundThrustLiquid
SONARCochleaECG
  
1) I am used to finding the direction of underwater objects by acoustic means. Who am I?
 
 
2)  It is the region of high pressure in a longitudinal wave. The term 'It' refers to?