Earth release can also be made from the body. That is a large part of this element as well. The rest is good. What are the interactions with the other four elements?
1. Wind
2. Water
3. Lightning
4. Fire
You can also list some advanced elements that are made from earth and another release.
1. Wind - Earth is neutral to wind, by using Earth you can block the wind due to it's solidity and the wind being nigh-intangible. But wind can still cut through earth due to it's sharpness.
2. Water - Earth is strong against water (A rank earth blocks S rank water) due to it's solidity again. When water hits earth, it displaces the water and pushes it away, making it very useful against it. But strong enough water can turn earth into mud.
3. Lightning - Earth is weak to lightning (A rank lightning breaks S rank earth) because of lightnings cutting and piercing capabilities. It loosens the earth and shatters it, causing it to crumble or explode into dust.
4. Fire - Earth is neutral to fire, it can block S rank fire with S rank earth due to the fire not being a solid object that the fire would wrap around instead of destroy. S rank earth stops A rank fire easily and both get destroyed at the same rank. S rank fire melts A rank earth because it's heat is greater than the earths density in that stage.
Some examples of earth based elements/kg are Lava Release which is the combination of Fire and Earth to create super heated rocks/magma. Another example would be mud, although mud is earth and not a KG, it still has liquid properties such as the fact that it flows when formed. But fire will cause it to harden into regular earth.