Mantle

The mantle is the region of Earth that lies between 30/35-2,900km below the
surface. Found here are: olivines, pyroxenes, and the silicate perovskite, a
dense form of enstatite.

The upper mantle is known as the asthenosphere.

----------------------------------------------------------------------------

A mantle is an organ possessed by molluscs used to secrete their shells.

----------------------------------------------------------------------------
A mantle is also a device used in Gas lamps and Kerosene lamps to produce a
bright light.

A mantle is basically a small sock made of silk or asbestos. Asbestos can
withstand high temperatures, but is also toxic. Silk-based mantles are
extremely brittle once first burned, and must be replaced frequently.

The traditional mantle is coated in thorium, which when heated enough (with
burning gas or kerosene vapour) incandesces brightly.

Thorium is radioactive, and pure thorium becomes more radioactive as it ages
owing to its decay products. It should be handled with care. Owing to
concerns about the radioactivity of thorium, alternatives are now used in
some countries, but these are more expensive and less efficient.

----------------------------------------------------------------------------

A mantle (also mantel) is the stone or wood beam which serves as a support
for the structure above a Fireplace, together with the whole framework,
whether of wood, stone, etc., that acts as an ornament of the same.

How to - Physics - History - Companies - Internet - Video Games - List of Phobias - September 11, 2001
Radio - Timelines - Chemistry - Genealogy - Family - Film - SARS - Cancer - Medicine - DVD - Calendar
Countries - Disease - Health Science - Dentistry - Economics - AIDS - Law - Autism - Statistics - Bible
Recipes - Architecture - Computers - History of the Internet - Personal computer - Apple Macintosh
War - Presidents of the United States - United States Constitution - Universe - Philosophy - Animals
Biology - United States Constitution - Marketing Topics - Sports - Television - History of Computing

Wills - Wills - Credit Cards UK - Personal Loans - Loans