A sandbar is formed by water moving sediment downstream.
Numerous sandbars and abundant woody debris provide valuable habitat for aquatic species.
Habitats for aquatic species are formed by water moving sediment downstream.
Water moving sediment downstream can form

1) fissures of hot, acidic water
2) taiga
3) underground systems
4) habitats for aquatic species
5) swamp vegetation
6) hurricanes
7) volcanoes
8) basic building blocks of life