Though next time, you don't have to edit. Just make a new posts. It makes things easy to follow.
Though you did not tell me what chakra and elemental chakra is, you only told me what they do.
Chakra is the energy within the body of a ninja comprising of two types of energy in one. The physical energy and spiritual. The combination of these two forms something that makes someone able to perform ninjutsu, genjutsu, etc.
Elemental chakra is a refined form of chakra. The way our chakra looks, behave can be refined thus I can superheat my chakra and make it hot than it should be, or make it sharp, cold, wet, heavy, corrosive. This makes the elements that we have today. Changing normal chakra to elemental chakra is done through nature manipulation.
Earth also known as earth crust is the land we live on. Hard, brown, rigid and essential for life.
Bring earth together with water and you have mud, Earth with wind and you have dust, Earth with fire and you have hot magma, or lava, earth with lightning and you have nothing though the earth absorbs lightning making it a good conductor of electricity and lightning passes through it easily.
Earth Release or Doton, is process of creating, manipulating or controlling earth through the use of our chakra. This is perfected after our mastery of nature manipulation where we are able to refine our chakra to earth like or to be in equilibrium with earth.
KGs that includes earth are lava, wood, steel, etc.
Earth is strong to water since it is rigid and able to withstand the flow and strenght of water. Earth is weak to lightning ofcourse due to their interaction I mentioned above.
Kay now I want you to begin to knead your chakra and use nature manipulation to give it earth properties.