1. Around 70% of the Earth's surface is covered by oceans.
2. The largest ocean on Earth is the Pacific Ocean, covering around 30% of the Earth's surface.
3. The name 'Pacific Ocean' comes form the Latin name Tepre Pacificum, 'peaceful sea'.
 4. The deepest known area of the Earth's oceans is known as the Mariana Trench. It's deepest point measures 11km. That’s a long dive down!
5. The world’s oceans are home to incredible creatures that are masters of disguise! Take a look for yourself...
http://www.ngkids.co.uk/science-and-nature/Ocean-Facts

Ocean
Bodies of salt water surrounding great land masses that cover 70% of the Earths surface.

Continental Slope
The steep slope down to the ocean floor

Abyssal Plain
The true ocean floor.  It has a flat smooth surface made from sediment from runoff of the continents and the surface of the water.

Continental Rise
The transition area where the continent ends and the ocean floor begins

Continental Shelf
The border of the continent that is below the water and slopes gradually away from the shore.

Ocean Trench
A deep cut in the ocean floor found near the abyssal plain.

Sunlight Zone
The sunlight zone is 0-200 meters deep. This zone gets the most sunlight and has the warmest temperatures. Pressure is not a factor for living organisms at this depth. ​

Twilight Zone
The twilight zone is 200-1,000 meters deep. Very little sunlight can get to these depths. Temperatures are moderate (20˚-4˚C) and pressure is moderate. ​

Midnight Zone
The midnight zone is 1,000-11,000 meters deep. No sunlight can reach these depths. Temperatures are just above freezing and pressures are strong. ​
Oranisms have adaptations to the characteristics of the ocean depth zone’s in order to survive.

Ocean Food Webs

An ecosystem is a natural system in which living and nonliving things interact. 

Plankton are organisms that are incapable of swimming against the movements of the water. Plankton float at the surface of the water and move with the currents. 

A food web consists of all of the interconnected and overlapping food chains in an ecosystem. A food web shows the paths energy and nutrients may take as they move through the ecosystem.

Atoms and Building Blocks

Atom
The smallest unit that makes up all matter. Atoms are so small they can only be seen with an electron microscope

Element
 A group of two or more atoms that bond together. Molecules are so small they can only be seen with an electron microscope

Molecule
A pure substance made of a single type of atom with certain characteristics. 

Compound
When atoms of different elements join together by chemical bonds; examples of compounds include H2O (water) and NaCl (salt). This means that all compounds are molecules, not separate atoms. 

Mixtures and Solutions

Mixture
 A combination of two or more substances that do not lose their identifying characteristics when combined. Because there is no chemical reaction, the substances in a mixture can be separated, and may settle on their own if left to sit

Solution
A combination in which substances are evenly mixed together. The substances in a solution cannot be separated by filtering. A solution is stable and doesn’t change over time or settle.

Salinity
Salinity is the amount of salt in water. 

Currents and Ocean Movement

Currents
A current is continuous movement of ocean water in a specific direction. 

Surface currents are horizontal (side to side) currents caused by winds and the rotation of the earth. There are many of these types of currents in the different oceans of the world; one is the Gulf Stream which is in the Atlantic Ocean. 

Deep ocean currents are vertical (up and down) ocean currents. They are caused by differing densities due to temperature and salinity.

Waves
Waves are up and down motions in ocean water caused by winds.

Tides
Tides are rising and falling on the oceans beaches because of the "bulging" of the earth’s ocean waters because of to the gravitational pull of the moon and sun.