### motion | wave:

P wave
* P Waves cause the booming sounds heard during an earthquake.
* are compressional or push-pull type waves
  - longitudinal waves that transmit energy through materials
  - sound waves and propagate through both solids and liquids
* can travel through all layers fo the Earth
  - solids, liquids, or gases
* move measurably faster through the inner core in a north-south direction than across it.
* progagate in the same direction that the wave is traveling.
* represents excitation prior to contraction of the atria.
* show that the top of the heart received electrical activity.
* transmit a strain that squeezes or expands a rock in the direction that the wave is moving.
* travel the same way as sound waves in air
  - through the inner core faster in polar directions than equatorial directions

### motion | wave | permanent:

Permanent insurance
* Provides life insurance throughout a person's lifetime.
* is intended to last for a lifetime, regardless of when death occurs.

Pressure wave
* are stronger than shear waves.
* can propagate from one medium to another.
* require gas.

Pulsation
* is phenomenons.
* moves the cilia back and forth, which helps restore normal movement of the cilia.
* occur at magnetically quiet as well as disturbed times.

### motion | wave:

Riffle
* also add oxygen to water making it possible to support more life
  - oxygenate the water
* are areas of swifter flowing water, where the surface is turbulent
  - instrumental in the formation of meanders , with deeper pools forming alternately
  - morning and evening feeding areas
  - shallow and fast water, runs are deep and fast water and pools are slow and deep water
* are shallow gravelly areas where salmon spawn
  - sections of the stream where water runs faster
* are shallow, gravelly, fast-water areas that are the main food production areas of streams
  - turbulent stretches where water flows swiftly over sand and rock
* are the preeminant feature of coldwater streams
  - sites of primary production
* have a fast current and shallow water
  - lots of oxygen which attracts macroinvertebrate

### motion | wave:

Ripple
* Most ripples are generated by sea surface waves
* Some ripples associate with alternate current electricity
* Some ripples depend on solar wind conditions
* also take the form of an expanding circle.
  - low ridges of sand
  - oscillations
  - small ridges of sand or silt deposited by wind or water currents
  - undulations of the sediment surface produced as wind or water moves across sand
* break the placid surface of a hot spring.
* form in the oil and a powerful light source shines through the oil film.
* formed by waves are nearly symmetrical with a slight coarsening in the troughs.
* forming on the surface of water, after a stone is thrown in.
* grow into wavelets, then into increasingly larger waves.
* travel faster in a connected medium.

Rogue wave
* are very rare large waves, probably due to unusual constructive wave interference.
* can arise in all oceans
  - occur on relatively calm seas with no storms for hundreds of miles

S wave
* are body waves that travel slower than P or primary waves
  - rotational and uncompressive
  - shear waves and propagate only through solids
  - transverse
* can only propagate through solids
  - travel only in solids
* oscillate the ground perpendicular to the direction of wave travel.
* require a semi-rigid medium.
* travel more slowly than P waves.

Secondary wave
* Secondary Waves move slower and travel through BOTH solids and liquids.
* cause vibrations which move perpendicular to the wave.