Hashirama arrives... Well...isn't this awkward! >_> Ok, I'll RP as myself. Ubber godlike entity of the NW, capable of unleashing tides of wood and stuff throughout. All hail the all mighty god of decay.
*thunder roars and lightning strikes all around*
anywho, tell me, what is Chakra, what is life, what is wood, what is water and what is earth?
Chakra
Chakra is the energy that resides within living beings and is created by the combination of the Phyisical and Spritual energy. The physical energy is tied to the body while the spiritual energy is tied to the persons mind, it's spiritual being.
Life
Life is basically the condition which separates animals, plants and humans from inorganic matter. Anything that lives breathes, eats and drinks to survive.
Wood
Wood in general is the hard fiber tissue which forms trees and branches. Wood is harvested from trees and used for building, heating oneself etc.
Wood Release or Mokuton in the Narutoverse on the other hand is a Kekkei Genkai which originates from Hashirama Senju. It is created by combining earth and water chakra to create the wood release techniques. It represents life and growth in a symbolic meaning. It is the most versatile KG seen so far, being able to produce and create basically anything imagined through the usages of it's techniques. It is weak to lightning since it can easily cut and rip through it as seen when Sasuke used Nagashi against Yamato's wood, and it is strong to earth and water, earth because it breaks through it and water because it can't simply do anything to the wood. It is also strong against Bijuu chakra and techniques as seen when Hashirama used it against Madara.
Water
Water is a liquid consisted of hydrogen and oxygen atoms. It is the life source of all living beings and no being can survive without water.
In the Narutoverse Water Release or Suiton is an element with which the user can manipulate, create and use water as they wish. Projectiles, streams, waves, dragons, blasts etc. Another very versatile element it is used to create several KG among them Mokuton. It is weak to earth, strong against fire out of obvious reasons.
Earth
The earth is the substance on the land, basically dirt, rocks, stones, etc.
Doton or Earth Release is yet another versatile element that allows the user to manipulate earthen surfaces such as rock, dirt and similar. It is used for the creation of Mokuton along with Suiton. Strong against water, weak to lightning.
I know the description is a bit thin ~_~