Examlex
Arrange the elements As, Cl, and S in order of increasing electronegativity .
Billion Years Ago
A time scale used to describe events and processes that occurred a billion or more years ago in Earth's history.
Burgess Shale
A Lagerstätte in Canada in which there is a wealth of preserved fossils from the Cambrian period.
Lagerstätte
Lagerstätte (plural, Lagerstätten) is a site with an abundant supply of unusually well-preserved fossils — often including soft tissues — from the same period of time.
Cambrian
A geological time period occurring approximately 541 million years ago, notable for the Cambrian Explosion, a significant increase in the diversity of life on Earth.
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