Okay, I have an idea:

Floating Island

occurs: In mountainous regions on planets with low gravity.

resources: Mostly rock and soil, however they are also known to be fairly mineral-rich.

elevation:7000-8000 m above sea level (varies depending on the planets gravity and magnetic field.

climate: Mostly cold (5-8 C), however areas closer to the planets equator can be slightly warmer.(6-10 C)

topography: Required= Floating around mountainous regions with sheer drops all around the islands . Small supports made of rock or vine keep the islands attached to the mountains, along with slightly poor soil in the colder islands.

biodiversity: Normally only 1, but can range to 2 or even 3 in warmer islands.

autotroph niches: Tiny to small

heterotroph niches: Herbivores are normally midlarge, and carnivores are normally small to midsize, but can be midlarge on occasion.

other: Flying animals normally live in floating mountains, with most herbivores only coming to graze or migrate. Many carnivores, however, are expert jumpers, gliders and climbers who live year-round in the floating islands, or the mountains around the islands. Though the soil may be poor, it only limits the size of the plants, which come in large numbers in the islands. Floating island biomes are actually clusters of the islands, with the individual islands themselves reaching about 4500 m wide, and the clusters carry 5-7 of the islands. Sometimes smaller islands called floating rocks appear, which reach about 2000 m large can appear, with 3-10 per cluster. Sometimes a single floating island or floating rock appears without a cluster.

Oh... sorry.

I thought that because of extremely low gravity, well...

Eh, I have other ideas.

Physics says hi. It also says, do not follow in the ways of James Cameron, for he is subject to the universal laws and very crunchy.

Nice try though. Unfortunately, magnetic force is not that strong, there isn't really a good force for opposing gravity that actually scales with mass like gravity does.

I came up with a sinkhole biome. Do you think that's a good idea? If It makes sense, I'll go into detail about it.

(oh, and again, sorry about the floating island. Yes, it was inspired by avatar. As well as making almost no sense, the physics required would absolutely break the game. )

Sink Hole

occurs: ??? (sorry, but that was the one thing I couldn't figure out.)

resources: Carbonate rocks

elevation: Bottom: anywhere from 50 m to 650 m below sea level. Width: anywhere from 30 m to 120 m wide. Top: At least 10 m above sea level.

climate: Varies depending on location. Normally semi-arid to wet.

topography: Required = Very steep drops from around the mouth of the hole, normally circular in shape.

biodiversity: 1, sometimes 2.

autotroph niches: Tiny, very,very rarely small.

heterotroph niches: Tiny or small for herbivores, very rarely up to midsize for carnivores.

other: Sink holes often have many deposits of carbonate rocks, i.e. limestone or marble.

Tell me if there is something I should change.

(P.S. sorry that I didn't get this out earlier. It takes a while for me to make biomes. Also, this is a non-submerged sink hole.)

Yeah, I was using wikipedia, but it wasn't giving me any info about HOW sinkhole are created. But thanks for telling me about how there can be more life in sinkholes, I'll make another post with that in mind.

Canyon
Occurs:Wherever theres a huge split in the ground
Resources:Depends on biome
Elevation:-500(land)
Climate:Depends on biome
Topography:Huge Dropoff
Biodiversity:2
Heterotroph:Tiny-Small Flying Herbivores,Small-Midsize Herbivores,Small Carnivores
Autotroph:Tiny-Small
Other:Can appear in any biome,Migrating animals may appear

Tundra
Occurs:at polar regions of planet.
Resources:Snow(like igloos),stone,saltwater.
Elevation:50m above sea level.
Climate:Extremly cold.
Topography:Top of Northern Hemisphere,Bottom of Southern Hemisphere.
Biodiversity:1
Heterotroph:Lichen sized plants,Artic moss
Autotroph:Hardy Small-Midsize Herbivores,Midlarge Carivores
Other:none