Examlex
The creation of an environment free of pathogens is ___________.
Silicon
A chemical element with the symbol Si, known for its semiconductor properties and widespread use in computer chips.
Oxygen
A chemical element with symbol O and atomic number 8, essential for breathing in most living organisms and a key component of water.
Earth's Crust
The Earth's crust is the outermost solid shell of the planet, composed of rock, and is the surface upon which we live. It varies in thickness and is thinner under the oceans and thicker under continental land masses.
Quartz
A hard, crystalline mineral composed of silicon and oxygen atoms, widely used in jewelry and as an industrial abrasive.
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