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Ultrasound loading

High-frequency sounds cannot be heard by the human ear but they can be used by some animals to see.

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Explore connections in math and science

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Discover related concepts in Math and Science.
Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Real World Application


    by CK-12 //basic
    Discover how advanced 3-D sonar was used to explore a ship in the Gulf of Mexico that was sunk in a battle during the U.S. Civil War.
    This indicates how strong in your memory this concept is
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