At the outer edges of the Great Plateau, the steep, debris-covered slopes are swept by winds bringing seasonal rains up from the Shallow Seas. The heavy rainfall and loose soil make for an unstable surface, prone to mudslides and rock falls. However, in many areas the surface is stabilized by plant life evolved to cope with just such conditions. The oceanward slope of the Great Plateau is green with grass trees. The tiny sliver spiders the cross gorges on grass seeds are only juveniles.