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Science Test 8

Across
This fish leaves the ocean and returns to the stream to lay its eggs.
Seawater is denser because it contains this.
Man eating fish.
Largest mammal ever!
The scientific study of the ocean is called?
Which ocean is the Mariana trench located in?
Hunted for its ambergris.
Down
Most intelligent invertebrate.
Fish with wing-like fins.
The largest fish of all.
Used messages in bottles to help his experiments.
This fish is caught for its meat and oil.
Churning waves help to make minerals and rocks in to particles of what?
What fish use to get oxygen from water.
What moves the ocean currents.