E.coli: Bacteria that
indicates water may be polluted.
EAR: Expired air resuscitation.
A term used for the technique of filling
a patient's lungs with air to supply blood
to the brain in resuscitation.
Ebb: The horizontal outflow
of tidal water to the sea.
Ebb tide: Out-flowing
tide from high tide to low tide; compare
with flood tide.
Echinoderm: One of a
group of invertebrate animals identified
by their spiny skin, including sea stars,
sea urchins and sand dollars. "Echinos"
means spiny; "derma" means skin.
of benthic animals having bilateral symmetry
in larval forms and usually a five-sided
radial symmetry as adults; phylum includes
sea stars and brittle stars.
Echo sounder: A machine
that determines water depth by measuring
the time it takes for sound waves to reach
the seafloor and bounce or echo back to
Ecology: The scientific
study of the relationships between plants,
animals and their environment.
Ecologically sustainable development
(ESD): Development which meets
the needs of the present without compromising
the ability of future generations to meet
Eco-ports: Ports that
can help ships discharge wastes in an ecologically
Ecosystem: The natural
system in which energy and nutrients cycle
between plants, animals and their environment.
tourism that involves education and interpretation
of the natural environment and is managed
to be ecologically sustainable.
Eddies: Large circular
moving bodies of water associated with ocean
Eelgrass: A water plant
with long, grass like leaves. Eelgrass is
one of the few flowering plants that lives
in salt water.
Egret: A wading bird
with long legs.
El Niño: A southerly
flowing warm current that generally develops
off the coast of Ecuador shortly after Christmas.
Associated with drought conditions in Australia.
Elder: One of the older
and more influential members of an Aboriginal
tribe. Can be male or female.
Elective: Refers to a
module or learning competency that you can
choose to do as part of a course.
Electroreceptor: an organ
specialized to detect electric signals.
Sharks have electroreceptors that help them
Emulsifier: A substance
that lets oil and water mix into a smooth
Emulsion: A mixture of
liquids of different types.
Energy: The ability to
do work; there are many different forms
Encrust: To cover with
a layer or crust.
Term used to describe any item or practice
that will not harm the environment.
Ephyra: A free-swimming
young jelly produced when a polyp buds
EPIRB: Emergency position
indicating radio beacon.
Equalise: In snorkelling,
to make your ears comfortable when you dive
underwater by compensating for changes in
Erosion: Process by which
weathered material is carried away by water,
wind or glaciers.
Epipelagic: The upper
sunlit ocean layers to 350 feet deep (107
meters), also called the photic zone.
Estuaries: The areas
of inlets or mouths of rivers which are
influenced by the tides and where salt and
fresh water mixes.
Ethnic backgrounds: Origin
of a culture.
Evaluate: Consider the
results of a set of measurements.
Evaporation: In which
water molecules are captured by warmer air,
causing them to become water vapour. This
leads to the actual amount of water constantly
Evolution: The process
of gradual change over long periods of time.
Exclusive economic zone (EEZ):
Concept proposed at the UN Law
of the Sea Conference whereby coastal states
assume jurisdiction over the exploration
and exploitation of marine resources.
Extinct: No longer alive;
no longer in existence.
Extinction: Process where
no more of a species live on our planet,
e.g. dinosaurs are extinct. Many species
are threatened with extinction.
Eyespots: A jelly's light-sensing
organs, usually found around the edge of
the bell. Also colour patterns used by fish
to confuse predators.