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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

3. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   The Dakota fire pit is an efficient, simple fire design that produces little to no smoke. [1] Two small holes are dug in the ground: one for the firewood and the other to provide a draft of air. Small twigs are packed into the fire hole and readily combustible material is set on top and lit. The fire burns from the top downward, drawing a ...

4. Defensive fighting position - Wikipedia

   en.wikipedia.org/wiki/Defensive_fighting_position

   Defensive fighting position. U.S. Marine in a fighting hole outside Beirut during the 1958 Lebanon crisis. A defensive fighting position (DFP) is a type of earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).

5. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Modern open fireplace. An outdoor fireplace. A fireplace or hearth is a structure made of brick, stone or metal designed to contain a fire. Fireplaces are used for the relaxing ambiance they create and for heating a room. Modern fireplaces vary in heat efficiency, depending on the design. Historically, they were used for heating a dwelling ...

6. Mortar (weapon) - Wikipedia

   en.wikipedia.org/wiki/Mortar_(weapon)

   However, both larger and smaller mortars have been produced. The modern mortar is a muzzle-loaded weapon and relatively simple to operate. It consists of a barrel into which the gunners drop a mortar round. When the round reaches the base of the barrel it hits a fixed firing pin that fires the round. The barrel is generally set at an angle of ...

7. Campfire - Wikipedia

   en.wikipedia.org/wiki/Campfire

   A small fire in a backyard fire pit. Ideally, campfires should be made in a fire ring. If a fire ring is not available, a temporary fire site may be constructed. Bare rock or unvegetated ground is ideal for a fire site. Alternatively, turf may be cut away to form a bare area and carefully replaced after the fire has cooled to minimize damage.