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Oil sands are WHAT
Oil mixed with sand
The oil needs to be separated in a process known as WHAT
SOLVENT EXTRACTION
In essence, sands mixed vigorously with WHAT, which dissolves WHAT and physically separates WHAT from WHAT
In essence, sands mixed vigorously with HOT WATER, which dissolves DIRT and physically separates WET SAND from OIL
Oil is WHAT, and floats to the top of the water thus being separated
Oil is IMMISCIBLE, and floats to the top of the water thus being separated