Kw-logo-holiday

Overview of Oceans

The Pacific Ocean is the largest ocean in the world.
Oceans

Oceans cover more than 70% of the Earth's surface and contain about 97% of the planet's water supply. It's home to underwater creatures, from the smallest plankton to the largest creature on Earth, the blue whale. Find out more about the fascinating world of the ocean!

Oceans - The Big Five

There is actually only one big ocean in the world, as every ocean and sea are connected. Until the year 2000, there were only four recognized oceans, but in the spring of 2000, the International Hydrographic Organization marked out a new ocean called the Southern Ocean. Now, there are five main areas in this one big ocean.

  • The Pacific Ocean is the largest of the five main oceans. It's 15 times the size of the US, covers about 28% of the global surface and is larger than the total land area of the world. With an area of 60.1 m2, it includes the Bering Sea, Gulf of Alaska, Philippine Sea and Sea of Japan.
  • The Atlantic Ocean is the second largest ocean. It's 29.6 m2 and includes the Baltic Sea, Caribbean Sea, Gulf of Mexico and Mediterranean Sea.
  • The Indian Ocean is 26.5 m2 and includes the Arabian Sea, Bay of Bengal, Persian Gulf and Red Sea.
  • The Southern Ocean is 7.8 m2. It surrounds Antarctica and includes the Amundsen Sea, Bellingshausen Sea and Ross Sea.
  • The Artic Ocean covers the North Pole. It's frozen all the time, except at its edges. It's the smallest ocean with an area of 5.4 m2, and includes Baffin Bay, Hudson Bay and Greenland Sea.

Oceans - The Blue Factor

When sunlight hits water, part of the light gets absorbed and part of it gets reflected. Sunlight appears to be colorless, which we call white light, but it's actually made up of all the colors of the rainbow. Blue light is absorbed by water at a slower rate than other colors of light. Pure water is also said to naturally be a faint turquoise color, but it is only visible when there is a lot of water in one spot - like an ocean. These two factors combined make for the spectacularly blue water you see at beaches around the world. If there are foreign particles, like sand, dirt or algae in the water, the color of the water can change because the light is now reflecting off something other than just water.

Oceans - Light Zones

The ocean is divided into three zones based on the amount of light it receives.

  • The Sunlit Zone is the top layer closest to the surface. More than 90% of all marine life live in this zone because there is enough light entering the water for photosynthesis to occur. The Sunlit Zone, which is about 600 feet deep, is where most fish and sea animals live.
  • The Twilight Zone begins at about 600 feet under the water to about 3000 feet down. Only a small amount of light can penetrate the water at this depth. As the water gets deeper, the pressure increases, so few animals and plants live in this zone.
  • Ninety percent of the ocean is in the Midnight Zone. It's completely dark and the temperature is near freezing. Living things in this zone include the sea cucumber, vampire squid and snipe eel.

Oceans - The Salt Factor

Ever wonder why the ocean is salty? As water flows in rivers, it picks up small amounts of mineral salts from the rocks and soil of river beds. This slightly salty water then flows into the seas and oceans. Ocean water evaporates through the process of the water cycle, but the salt doesn't evaporate and remains dissolved in the ocean. As time passes, the remaining water gets saltier and saltier.

 
Related Stories:

 

>

readers voted!

Comments

CuteMoo2

CuteMoo2 wrote:

O.O I Dont Know How To Swim Lol cx
commented: Wed Apr 30, 2014

miz-wolf1

miz-wolf1 wrote:

I love to swim but I'm kind of scared of the ocean. I cant really explain why but I think it has something to do with my fear of outer space
commented: Sun Oct 06, 2013

brunostar

brunostar wrote:

i love the ocean so much ^-^
commented: Wed Jun 05, 2013

there are 4 more comments

Please login or register to add comments


like this article?
Sign up now to get more just like it!

latest videos

F1108575610203

What Do You Like About the Ocean?

  • Everything - I wish I could live in the ocean!
  • The relaxing sound of the tide coming in.
  • The waves - surf's up!
  • Nothing - I'm afraid of the water.

related stories

Micro_a pre
As summer warms up, you're probably hanging around the lake or ocean more and more to keep cool. ...
Micro_a m
Kidzworld’s All About Animals is going to take a look at Dolphins this week! Dolphins are the fri...
Micro_world-ocean-day-micro
June 8 is World Oceans Day in honor of our, magical, mysterious ocean! So much about our ocean is...
Micro_costarica-article
Costa Rica is a country in Central America that’s got two spectacular bodies of water on either s...

Random in the forums

GawjussGracieex
Dear god this got bumped :O YAY
reply 17 minutes
FroggyBurton
FroggyBurton posted in New Users:
Greetings to whom reads this! My name is Howard and I want to welcome you to KidzWorld! So many kids waiting to be your friend! Feeling a bit shy to meet new people? Not to worry! Kids here are very friendly especially Jr. Mods, Mods and Admins! They all bring safety to this website and only try to make your needs/wants fulfilled. Please don't hesitate to ask me questions or add me :D
reply about 2 hours
MovingBrick
MovingBrick posted in General:
Dear god this got bumped
reply about 2 hours
Mrawsomegamer
Mrawsomegamer posted in Debating:
Oh! and if you did know about this, and sent an ##### to our school, then thank you for the support. :) We'll never be able to get over it, but we'll get by.  Thanks! :) R.I.P Mrs Maguire, gone but never forgotten...  :angel (Sorry for clogging up this debate, but the moral of the story is world wide, people are getting away with crimes like murder, and/or hurting somebody seriously...  This needs to be stopped... If the death penalty came back, I know for a fact it would scare people into doing the right thing, I don't know about America, but I'm sure it would in England.)
reply about 2 hours
MissFrankTurner
"I don't know about you, but you're looking 22". - Taylor Swift
reply about 2 hours

play online games

Hour-of-code-tumb

Codey the troll is lost! Help him avoid obstacles and get back into the computer...

Candy-quest-feature

Your troll is lost! Help it avoid obstacles and get back into the computer.

Fo...

Dragon-dash

Your dragon must return to guard the treasure! Help it gather lost coins and avo...

_thumb_100x100

Shoot blobs with different properties to merge yellow blobs. Your blobs can be r...

1005_cc_kidz_100x100_vlh

Candy's got her candies into a terrible mess, can you help her to sort them out?

Candy-100

A great online version of the famous Candy Crush. This is the best game launched...

_thumb_100x100

Bloons 2 is here! A worthy and awesome sequel at last to our original Bloons gam...

Frostbox_100x100

Explore the world or hang out with friends in your own condo. Get a unique look,...