Examlex
The Cambrian explosion started _______ the Cambrian and lasted for _______ of years.
Gallium
A soft, silvery metal used in electronics and low melting point alloys.
Germanium
A chemical element with the symbol Ge and atomic number 32, used as a semiconductor in electronics and as an alloying agent.
Argon
A noble gas element that is colorless, odorless, tasteless, and non-toxic, used in lighting and welding.
Chromium
A chemical element with symbol Cr and atomic number 24, known for its high corrosion resistance and hardness.
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