Or What do we use to study the marine world?

Physical PropertiesSecchi Disk

measures turbidity/visibility

turbidity - cloudiness due to the amount of suspended matter in the water (soil, sediments, sewage, and plankton)Clear - low turbidityCloudy - high turbidity

Biological PropertiesDip Net

retrieves a variety of samples from the water

Physical PropertiesHydrometer measures density & temperature, used to find salinity

HYDROMETER

Physical PropertiesNiskin / Nansen Bottle

obtains water samples at a variety of depths

NISKIN BOTTLE

Biological PropertiesSediment Screen

used to screen sediments for macro invertebrates

Physical PropertiesShipek/Peterson Grab

take a sample of the ocean bottoms

Physical Properties

CTD measures

conductivity, temperature & depth

GPSProvide radio-

navigation system giving every place on Earth an address

Biological PropertiesPlankton Net

net towed or dipped to gather plankton samples

Research VesselsResearch

submersibleCan carry

passengersReach depths

of 14,764 ft.Maneuverable

arms, 3 portholes

ALVIN

Physical PropertiesThermometer

measures & records temperature at a particular depth

Research VesselsTrieste – first bathyscaphe to

descend 35,600 ft to the bottom of the Mariana Trench