A continuous horizontal flow of water in a given direction that carries warm water.
What is surface current
100
The natural home or environment of an animal, plant, or other organism.
What is a habitat
100
Underwater areas with high densities of kelp
What are kelp forests
100
The alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
What are tides
100
The saltiness or dissolved salt content in a body of water
What is salinity
200
A rising of seawater, magma, or other liquid
What is upwelling
200
The act of depleting a natural stock of fish by too much fishing
What is overfishing
200
The vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
What is tidal range
200
The degree of compactness of a substance
What is density
300
The downward fluid of movement
What is downwelling
300
The tidal mouth of a large river, where the tide meets the stream
What is an estuary
300
Plankton consisting of microscopic plants.
What are phytoplankton
300
A tide just after a new or full moon, when there is the greatest difference between high and low water
What is spring tide
300
A system for the detection of objects under water and for measuring the water's depth by emitting sound pulses and detecting or measuring their return after being reflected
What is sonar
400
This is the process by which water and sediments in the sea are drawn into the length of the beach in one direction due to waves and currents that approach the shoreline. This is dangerous to swimmers and surfers.
What is longshore current
400
An opening in the sea floor out of which heated mineral-rich water flows
What is a hydrothermal vent
400
Small organisms that thrive in extremely hot environments
What are thermophiles
400
The ______ tide is on the side of the earth facing the moon
What is direct tide
400
A community of living organisms, made up of fish, plants and other underwater creatures.
What is a coral reef
500
A relatively strong, narrow current flowing outward from the beach through the surf zone and presenting a hazard to swimmers.
What is rip current
500
The area that is above water at low tide and under water at high tide.
What is inter-tidal zone
500
The unwanted fish and other marine creatures caught during commercial fishing for a different species
What is by-catch
500
A tide just after the first or third quarters of the moon when there is the least difference between high and low water
What is neap tide
500
What non-living things are found within ocean water?