In class today we continued learning about Unit 9 and also learned more vocabulary on top of the ones we learned the other day. The new vocab words are refraction and dispersion. When something refracts it's the bending of waves, this is not to be confused with reflection which is when waves bounce. Bats use reflection to locate insects that they eat. They also use it to prevent themselves from crashing into other bats while they're flying around in their cave. We saw in class how ocean waves can bend or spread depending on the shape and slope of the sea floor. For example if the sea floor comes gradually to the beach it won't make waves that have barrels, all you'll get is a huge lump of water. But if the sea floor goes from extremely deep to extremely shallow you'll get something like Sandies or Waimanalo where waves always have barrels and break nicely. In class we've mainly been talking about sound, sound is a mechanical wave traveling through a medium. Sounds shape is a longitudinal wave and it needs a medium to travel. Every frequency of sound travels at same speed and temperatures. Sounds travel fastest through solids.  Humans can't hear all sounds because some wounds are either to high pitched or to low for us to hear. Sound is measured in Hertz or Hz.

Waves at Sandies are good because of the drastic change from deep water to shallow water. All the water is pushed into the shallow water so you have a big surge which leads to better waves.