Enter a clue or pattern or both:
The Clue
Element used to make semiconductors (7 letter answer)
The Answer
SILICON
Tags
Notes
The answer SILICON is rarely seen, appearing only about once every 1200 puzzles.
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More than a quarter of the earth's crust
Definition
SILICON as a noun:
1. (silicon, Si, atomic number 14) = a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors