Waves are created by energy passing through water, causing it to move in a circular motion. However, water does not actually travel in waves. Waves transmit energy, not water, across the ocean and if not obstructed by anything, they have the potential to travel across an entire ocean basin. Ocean Waves are disturbances in the surface of the ocean. They can be created by wind, gravity, or other displacements of water. Satellites typically measure significant wave height, which is the average wave height of the highest third of waves in a given sample period. A wave is a disturbance in a medium that carries energy without a net movement of particles. It may take the form of elastic deformation, a variation of pressure, electric or magnetic intensity, electric potential, or temperature. There are different kinds of waves with four of them being: tsunamis, wind waves, ocean swells, and tidal waves. A surge, or tidal surge, is a large sea wave or a sudden, strong, wavelike volume of water. These waves roll upon the shore like a massive sea level rise and can reach far distances inland. The gravitational pull of the sun and moon on the earth also causes waves. These waves are tides or, in other words, tidal waves. It is a common misconception that a tidal wave is also a tsunami. The five main characteristics of sound waves include wavelength, amplitude, frequency, time period and velocity. The sound of waves has also been proven to relax the mind. As waves come in, crash, and then recede again, the parasympathetic nervous system is activated, which slows down the brain and helps promote relaxation. Shuster describes this as “de-stimulating our brains Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.