2. Ultrasound Infrasound From the Giraffe

3. Infrasound Bats use ultrasound for navigation. Whales use infrasound. Dolphins use ultrasound

5.  Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing

6. When two waves that are the same come together to make 1 big wave.

7. When two opposite waves come together to make a different wave.

8. When a wave bounces off of something then comes right back.

9.  When a wave passes through one medium to another.

10.  When a wave goes around an obstacle.