Re: How come in the ocean it's shallow at the begining but then gets deeper?

Actually, the ocean stays at the same level. It's the land that gets higher and lower!

The land that we are standing on is pretty much just the top of a very big hill that goes all the way to the ocean. Try a little experiment: Dump a handful of sand into a puddle, until the sand builds up above the water to make a little island. You'll see then why the water is shallow around the edges of the island, and gets deeper further out: the water hasn't changed, but the "land" has risen.

Very very very very big islands are called "Continents." We live on one called North America. If you were to take all the water out of the ocean and look at North America, it would look just like that pile of sand (only a little flatter on the top).