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  • environment
  1. A layer of clay, or other impermeable material installed over the top of a closed landfill to prevent entry of rainwater and minimize leachate.
    Source: Terms of the Environment
  • geology
  1. A detonator or blasting cap. Nelson
  2. To seal, plug, or cover a borehole. Long
  3. The roof or top piece in a three-piece timber set used for tunnel support. Nichols, 1
  4. A piece of plank or timber placed on top of a prop, stull, or post. Long
  5. The horizontal member of a set of timber used as a roadway support. Nelson
  6. Another name for crown. ASTM
  7. Barren rock and/or soil covering an ore deposit. See also: cap rock Long
  8. Overburden consisting of unconsolidated material overlying or covering bedrock. Also called cover; mantle. Syn: top
  9. See: blue cap
    Source: Dictionary of Mining, Mineral, and Related Terms

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