Theory:Abilities by classical element/Earth

Earth: Manipulations and/or enhancements of one's own body

Abilities	Arguments
Ability theft	+ Although not an outright ability, Noah's exchange with Sylar in Fallout regarding Sylar's stolen abilities, and the fact that this strange and mysterious procedure can even be performed, indicates that it alters the body of the person performing the it, granting the performer the ability of the victim.
Acid secretion	+ The ability may be an enhancement to the sweat glands on the user's forearms and hands such that user can secrete a highly corrosive acid through his skin.
Alejandro's ability	+ Renders the user's body immune to the effects of poison emission. Also enables the user's body to render the poison inert.
Aura absoption	+ Enables the user's body to absorb the life energies of another individual and also any evolved human abilities that person may have.
Cloning	+ Clones emerge from, an thus are created by, the user's body.
Empathic mimicry	+ This ability requires Earth to alter genes to use a stored ability. Use also requires Air to absorb a new ability, and potentially any of the four elements when replicating the stored ability.
Enhanced hearing	+ Enhances the sense of hearing, enabling the user to hear fainter sounds than they would otherwise.
Enhanced memory	+ Enhances the memory capacity of the user.
Enhanced speed	+ Enables the user to move at faster speeds than normal.
Enhanced strength	+ Enhances the amount of physical force that can be applied by the user.
Invisibility	+ May alter one's own body and thus be Earth. - May instead involve projection and thus be Air, or alter perception and thus be Water.
Lung adaptation	+ Altering of one's own body to adapt one's lungs to any environment.
Mohinder's ability	+ Mohhinder injected himself with his own serum. In describing the effects and sensations produced he has said: "My senses are heightened. I'm stronger, faster, more agile. I have boundless energy. I'm a new man!" • The serum may be affecting his anatomy, as he as developed weeping sores.
Nerve gas emission	+ Renders the user's sweat glands able to emit a deadly toxin, which evaporates into the environment. The user seems to be unaffected by the toxin
Phasing	+ Enables the user's body to pass through objects, potentially by shifting the user's body into another dimension. - May accomplish this instead by altering the other atoms/molecules themselves or shifting them to another dimension.
Plant mimicry	+ Enables the user's body parts to mimic the function and appearance of any desired plant.
Poison emission	+ Renders the user immune to a very deadly poison or enables the body of the user to create the poison.
Rapid cell regeneration	+ Enables the user's body to heal itself at a faster rate than normal.
Sound manipulation	+ Enables the user's vocal cords to generate any sound. Also uses fire.
Sound absorption	+ Enables the user's body to absorb and nullify sound waves.
Telescopic vision	+ This ability uses both Earth and Water: The user has an enhanced visual cortex (part of the brain) that lets the user see at telescopic distance and at night.
Water mimicry	+ Enables the user to turn his body into water or a similar substance.