Threats to Biodiversity

How does sand form?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. Sand, quite simply, is formed from the tiny remains of rocks. Over time these rocks erode down to small particles, which are eventually picked up by wind, water or even glaciers. The composition of sand varies from place to place, depending on the makeup of the local rocks, but the most common ingredient in sand is silica. When sand is deposited and piles high enough, that deposit becomes a sand dune.

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