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Hydrothermal circulation in the oceans is the passage of the water through mid-oceanic ridge systems.. The term includes both the circulation of the well-known, high-temperature vent waters near the ridge crests, and the much-lower-temperature, diffuse flow of water through sediments and buried basalts further from the ridge crests. [3]
[1] Günter Wächtershäuser proposed the iron-sulfur world theory and suggested that life might have originated at hydrothermal vents. Wächtershäuser proposed that an early form of metabolism predated genetics. By metabolism he meant a cycle of chemical reactions that release energy in a form that can be harnessed by other processes. [56]
A form is a document which contains blank spaces (also named fields or placeholders) in which one can write or select an option. Forms can be distributed to several signatories at once, or made available on demand. Before being filled out, each copy of a form is usually identical, except, possibly, for a serial number. A form allows an ...
This standardized template conforms to guidelines by the user warnings project. You may discuss the visual appearance of these standardized templates (e.g. the image in the top-left corner) at the user warning talk page. Please refer to the index of message templates before using any template on user talk pages to warn a user. Applying the best ...
Title catalog: a formal catalog, sorted alphabetically according to the article of the entries. Dictionary catalog: a catalog in which all entries (author, title, subject, series) are interfiled in a single alphabetical order. This was a widespread form of card catalog in North American libraries prior to the introduction of the computer-based ...
Hot-water baseboard-style radiator (top) which is covered (left) and opened (right), with inside view (bottom) showing the aluminium fins which are attached in series to the copper pipe A hot-water radiator consists of a sealed hollow metal container filled with hot water from a boiler or other heating device by gravity feed, a pump, or natural ...
Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor. Heating is achieved by conduction , radiation and convection .
A baseboard differs from a wainscot; a wainscot typically covers from the floor to around 1-1.5 metres (3' to 5') high (waist or chest height), whereas a baseboard is typically under 0.2 metres (8") high (ankle height). Plastic baseboard comes in various plastic compounds, the most common of which is UPVC.