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Periodic Table of the Elements: Uranium

(Encyclopedia)Periodic Table of the Elements: Uranium ...

Periodic Table of the Elements: Vanadium

(Encyclopedia)Periodic Table of the Elements: Vanadium ...

Periodic Table of the Elements: Xenon

(Encyclopedia)Periodic Table of the Elements: Xenon ...

Periodic Table of the Elements: Ytterbium

(Encyclopedia)Periodic Table of the Elements: Ytterbium ...

Periodic Table of the Elements: Yttrium

(Encyclopedia)Periodic Table of the Elements: Yttrium ...

Periodic Table of the Elements: Zinc

(Encyclopedia)Periodic Table of the Elements: Zinc ...

Periodic Table of the Elements: Zirconium

(Encyclopedia)Periodic Table of the Elements: Zirconium ...

Peter, epistles of the New Testament

(Encyclopedia)Peter, two letters of the New Testament, classified among the Catholic (or General) Epistles. Each opens with a statement of authorship by the apostle St. Peter. First Peter, the longer book, is addre...

Pitch Lake

(Encyclopedia)Pitch Lake, pool of pitch (asphalt), c.114 acres (46 hectares), SW Trinidad island, Trinidad and Tobago, near La Brea. The lake is believed to be formed and supplied by the seepage of natural pitch, a...

Permian period

(Encyclopedia)Permian period pûrˈmēən [key] [from Perm, Russia], sixth and last period of the Paleozoic era (see Geologic Timescale, tablegeologic timescale, table) from 250 to 290 million years ago. Many ma...