Answer:
Maritime marauders
I occur twice in eternity. And I'm always within sight.
Even if you throw it away, it still comes back.
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
What travels from coast to coast without ever moving?
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?