Rocks And Minerals

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sediment = matter which falls on the bed of the reservoir containing water sedimentary = (of rock) that has formed from sediment deposited by water or air shale = a fine-grained sedimentary rock that is formed when silt and clay are compressed slab = a large, thick, flat piece of stone or concrete, typically square or rectangular in shape evaporation = the process that changes liquid water to gaseous water (water vapor) sodium-rich = full of the chemical element of Na lead of pencil = the marking substance in a pencil sulfur = the chemical element of S, a yellow combustible non-metal See also Gems
EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.