1) How do we get information about salinity in the ocean? a) By measuring pressure b) By measuring conductivity c) By measuring temperature 2) Which family of instruments is particularly suited for accessing remote locations? a) Gliders b) Moored buoys c) Animal-borne sensors d) Ship-based measurements 3) What causes ocean acidification? a) The hole in the ozone layer b) Plastic pollution c) Excess CO2 in the ocean 4) Which instrument can be directly piloted by scientists? a) An Argo float b) A glider c) A drifting buoy d) A sea turtle-borne sensor 5) When layers of water don't mix, they are: a) miscible b) stratified c) hydrophobic 6) What does XBT stand for? a) eXpendable BathyThermographs b) eXtreme Benthic Temperature c) eXpendable Buoy Thermometer 7) What is at the base of the ocean food chain? a) Shrimps b) Plankton c) Sharks d) Seagrass 8) What does a sea level gauge use nowadays to measure the height of seawater? a) GPS b) An anchored float c) Radar technology 9) If you go deeper in the water, the pressure will be: a) lower b) higher c) the same 10) Which network gathers the greatest number of different ocean observations? a) Long-term time series sites b) High-frequency radars c) Argo floats d) Ship-based measurements

Test your knowledge about ocean observing networks and the information they provide!

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