Geokinesis

Toph Beifong — Invents metalbending by finding the earth still inside refined metal

Toph Beifong — Bends by sensing the ground rather than seeing the target, which is why blindness is not a limit

Terra — Raises and hurls landmasses at a scale the Titans cannot counter

Terra — Control is stated to be limited by her own instability rather than by power

Sandman — Shifts between solid, granular and dispersed states at will

Crocodile — Turns ground to sand and drains moisture from anything he touches

Gaara — Moves sand as an automatic defence without conscious direction

Magneto — Acts on the iron content of rock and soil, which is why he can move terrain at all

Clayface — Reshapes his clay body into tools, weapons and other people

Clayface — Forms weapons and tools directly out of his own clay

Clayface — Absorbed material changes his mass, which is the stated limit on how large he gets

Gaara — Crushes rock into fresh sand when his supply runs out

Gaara — Raises terrain to reshape the battlefield rather than to strike

Crocodile — Raises sandstorms large enough to bury a city

Crocodile — Collapses ground beneath opponents by removing its cohesion

Sand — Travels through earth and rock as easily as through open ground

Sand — Senses movement through the ground at distance

Rasa — Draws raw material from the ground to replenish his supply

Rasa — Compresses earth into projectiles at speed

Toph Beifong — Fights and wins as an underground earthbending champion while blind

Toph Beifong — Bends earth in precise small quantities, not only in bulk

Terra — Raises and hurls landmasses at a scale the Titans cannot counter

Terra — Triggers localised earthquakes rather than throwing rock

Terra — Her control is stated to be limited by her instability rather than by power

Aang — Earthbending requires meeting force head-on, which is why it is hardest for him

Aang — Energybending, learned outside the four elements, is what resolves the finale

Edward Elric — Transmutes stone and metal by clapping, without drawing a circle

Edward Elric — Circle-free transmutation is possible only because he has seen the Truth, at the cost of his arm

Edward Elric — Human transmutation is the one prohibition, and the source of the whole plot