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, Classification of structures U1: Definition and purpose
• Structures are natural or manufactured. • A structure is something made to do a job.
• Natural structures also protect, support,
• Structures support, protect, hold, or cover things.
contain, span.
• Anything that does these jobs is a structure.
• Examples: caves, nests.
• A blanket fort is an example of a structure.
Contain
U1: What • Shopping basket holds groceries.
• Keeps items inside.
are • Basket = structure.
Sample structures
• Shelter is a basic need.
Protect
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Span
Span means go over a gap.
Ladders span ground to roof.
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Houses protect people.
Barns protect animals.
Silos protect crops.
Greenhouses protect plants.
• Bridges span rivers and roads. Support
• Bridges are structures.
• Buildings and made items. • Support means hold up.
• Examples: buildings, bridges, malls, car parks. • Bridges have support structures.
• Built by construction. • Houses have foundations.
• Some supports are part of structures.
• Others only support.
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, Sample
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