If your tree is old, this is just part of a natural process - as the tree grows, the roots get bigger and come up out of the soil. If the tree isn't very old, it's probably a sign of thin topsoil. Although the tree might be more prone to falling over in high winds, it's really more of a cosmetic problem than anything. You can try adding a thin layer of topsoil and planting a groundcover like monkey grass to hold it in place and hide the roots, but it won't hurt the tree if you leave it as it is. This article covers the problem in more detail: https://www.gardeningknowhow.com/ornamental/trees/tgen/exposed-tree-roots.htm
Answered on March 29, 2018
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