Believe it or not, earthquakes (EQs) in the seabed can generate noises as loud as a nuclear explosion. They are very dangerous to marine mammals and are no doubt the cause of whale and dolphin mass beachings for millions of years.
The stress in the seabed usually builds up slowing before the main shock occurs. This is called EQ preparation. There are many micro EQs during this stage. These micro events give off high frequency noise that cetaceans should be able to detect; however, not all EQs are preceded by detectable micro events.
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Yes
No They Dont
Yes they can
Dolphins hide from sharks and dolphins can also sense danger.
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hearing
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This literally makes no sense.
Dolphins
that doesn't make any sense plus the dolphins disapeared!(see "Hitchikers Guide To The Galaxy")
Dolphins smell all fishy sense they live in the ocean all the time. Dolphins also smell like salt water.
Dolphins' eyes are round. They have an acute sense of vision, both underwater and outside of water.