The word heading has various meanings:

* In computing, a heading is used to provide hierarchical information about other information. Headings can emphasize or tell people what information is where, such as a title or subtitle or topic at the top or beginning of a paragraph or letter or chapter. Headings are used in wiki, HTML, and other markup languages.

* It is synonymous with the related word Headline.

* In navigation, a heading is the direction a person or vehicle is facing or pointing.

* In some mining jargon, a heading is a communication tunnel which is being extended in a given direction.

Bench height would be designed considering terrain condition, Geological setup of the area. For i,e Coal mines in Indian context , 6 m height and 10m width which we normally follow here.

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S.Chandrabose

In the full version of Minecraft, obsidain is usually found in the deep part of caves. Since there are no cave systems in minecraft pe, it's really hard to find it. You just have to keep on mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining until you luckily find obsidian.

The plural form for the noun bench is benches.

Bench is a noun (a bench) and a verb (to bench).