### current:

Rip current
* Many rip currents are temporary, while others are permanent.
* are Florida's most deadly weather-related hazard.
* are a potentially dangerous effect of longshore currents
  - shore-normal current
  - also common around piers and natural reefs
  - by far the biggest killers of ocean swimmers
  - formed when water moves away from the shoreline
  - generally more prevalent after storms
  - just one of many beach hazards
* are most common in the latter part of the year, during storm season
  - when it is windy
  - one of the major causes of accidents in the water
* are powerful currents of water moving away from shore
  - that can pull even experienced swimmers away from shore
  - short lived
  - sometimes narrow channels of water that flow out to sea
* are strong flows of water returning to the sea
  - narrow channels of water that flow seaward
  - strong, swift-moving channels of water rushing from the shore out to sea
  - swift rivers of backwash surging through the surf
  - the most dangerous current for any beachgoer
  - very dangerous and can pull people out to sea
  - visible from shore
  - water channels that flow away from the shore
* can be hazardous to people who are in the water
  - very strong
  - drag swimmers away from shore
  - endanger inexperienced swimmers
  - occur on calm days
  - potentially occur wherever strong longshore variability in wave breaking exists
* consist of feeders, a neck, and a head.
* form when a longshore current turns away from the shore toward the open lake
  - where water is channeled back into the ocean
* have larger, choppier waves, with calmer ones near shore.
* increase in size and intensity and decrease in number as waves increase.
* occur when holes develop in the sand bar
  - large amounts of water accumulate near shore due to natural wave action
* run perpendicular to the shoreline, flowing straight out to sea.

Riptide
* are books
  - part of tide
* can be dangerous, especially for children.
* is current
* occur when a tide opposing another tide or other tides, produces violently disturbed water.

Strong current
* Strong Currents develop when there is the presence of wind.
* are present near the outer reefs.
* can carry away the best of swimmers
  - come in to within meters of the coastline in some places
* require training and ability to maneuver quickly and effectively.

Tidal current
* are capable of erosion
  - negligible at high and low tides
* are periodic with a net velocity of zero over the particular tidal cycle
  - of zero over the tidal cycle
* can be complex due to the many islands, bays, and passages
  - dramatically slow down or speed up the progress of the boats
  - exceed three knots and standing waves, rips, can be more than ten feet high
  - influence vertical mixing
* generates electricity.

### current:

Turbidity current
* are among the most common kinds of density currents
  - erosive and can form submarine canyons on the continental slope
* are important agents of transport to the deep sea
  - to people because they damage equipment on the ocean floor
  - submarine avalanches
* bring sediments down the continental shelf.
* can even flow uphill but normally follow old channels on the continental slope
  - happen at a range of scales and can travel fast or slow
* flow because the sediment water mixture is denser than surrounding water.

### current:

Water current
* Some water currents are small and narrow far below the boat.
* can easily carry along unicellular organisms because they are so tiny
  - speed up or slow the boat, depending on their direction
* have a tendency to carry nonmotile types in the direc- tion of the flow of water.
* is the rate at which water flows past a point on the water circuit.
* keep fine solids in suspension, reducing light penetration to the benthos.
* moving through the sponge are created by the beat of flagellae.
* provide oxygen and nutrients for plants.