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The shells are a Cover formed for the most part by calcium carbonate, which protects the body of the molluscs and which can consist of a single piece or valve. 

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Artificial structures are those made by humans to satisfy a need..

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These are solid, heavy and very sturdy structures.  Examples: Walls, Dams and in acient times, pyramids (Like the ones in Egypt and Teotihuacan)                

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These structures are formed by bars arranged to form triangles or trusses. They are lightweight but sturdy.

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These are constructed with lintels. A lintel is a horizontal beam placed on vertical supports used to cover spaces. 

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They are globe-shaped structures formed by triangles that,in turn,form pentagons or hexagons.They can be regarded as a mixture of truss and vaulted structures.

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Geodesid structures - Estructuras geodésicas

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Geodesid structures - Estructuras geodésicas

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These are made up of sheets that form a protective housing and support.

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Caused by two forces acting on a body, tending to flex or bend it.

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These are formed by pillars and beams that are connected to each other and, along with the foundations, act as supporting elements

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Pillars are vertical elements that support the beams and the rest of the structures. Beams are horizontal elements that support the weight of the floors and cellings above. A collumn is a cylindrical pillar and is usually visible.

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These structures are held in place by stay cables, usually made from steel, attached to sturdy supports. They are often found bridges.

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Cable-stayed or suspension structures - Estructuras atirantadas o suspendidas

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Cable-stayed or suspension structures - Estructuras atirantadas o suspendidas

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Caused by two oppositely directed forces acting on a body, tending to stretch it.

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Tension (or traction) - Tensión (o atracción)

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Tension (or traction) - Tensión (o atracción)

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These are formed by canvases streched by compressed air. They have been developed in recent years and arer used for pavilions and shelthers. They are used

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as emergency architecture for disasters.

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Arches and vaults are formed by stone blocks supported by their own weight. They are used to cover a space between two pillars or walls. 

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Arched  and vaulted structures - Estructuras arqueadas y abovedadas

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Arched  and vaulted structures - Estructuras arqueadas y abovedadas

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Just remember that an arch is linear and a vault is superfecal

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Caused by two oppositely directed forces acting on a body, tending to flatten it reduce its length or thickness.

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Caused by two oppositely directd forces acting on a body along a very close lines of action, tending to cut it

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Caused by two oppositely directed forces acting on a body, tending to twist it

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The structure must remain rigid,i.e. it must not deform, under the action of the forces to which it is sujected over its useful life.

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Trussing is a method for making weak structures more rigid. It works because the triangle is the only figure that cannot be deformed. Therefore, structures that have a triangular shape are rigid

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The structure must remain in stable equilibrium under the action of the forces to which it is subjected over its useful life

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The structure must resist the forces To which it is subjected over its useful life. To improve the strength of a structure, we must choose the best material 

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This is why materials engineers study them to determine how well they resist different types of strees