kool well here it is!
Earth is one of the basic 5 elements of the nature. The ninjutsu involving Earth is called as "Doton," "Earth Release" or "Earth style" . The doton element is common among the shinobis of Iwagakure. doton techniques have the ability to change the strength and composition of the earth from being as hard as metal to as soft as clay, as well as manipulating their density, making them heavier or lighter.This allows the user to travel through ground and rock in various ways which can be essential for both transportation and for setting up attacks or creating defenses or offence. This makes earth techniques one of the most versatile of the elemental techniques. Pre-existing earth is not necessary though, for the user can create it with their own chakra.
Doton is strong against suiton because earth can stop the flow of water and can easily absorb it. eg. A large wave of water can be easily stopped by a Earth style wall.
Doton is weak against Raiton because the earth is a very good conductor of electricity and so raiton attacks will be super effective against doton.
users: Mu, Ohnoki, Hashirama, kitsuchi, Yamato and Hiruzen.