Waves and Tides

This is just a little but about waves that can help all those people out there who haven't taken the test (i think just me) study.

Parts of a wave

Crest - The top of a wave
Trough - The lowest part of a wave
Wave length - The distance between two troughs or two crests
Wave height - The distance between the crest and the trough
Period - the time elapsed between two waves (for 6-16 seconds)

Tides - the rise and fall of the ocean caused by the gravity of the sun and moon

Ebb current - where the tide goes out and the water moves out
Flood current - where the tide comes in and the water floods in
Spring tides - very high and very low tides
Neap tides - high and low tides less extreme
Semidiurnal - two equal high and two equal low tides a day (east coast)
Mixed semidiurnal - high and low tides are different but there are two a day (west coast)
Diurnal - one high and one low tide per day (gulf of mexico)

That's pretty much all I know about waves and tides so hopefully this helps me on the test.