Building Construction
Mansard roof is a roof which slopes in

Two directions without break in the slope on each side
Four directions without break in the slope on each side
Four directions with break in the slope on each side
Two directions with break in the slope on each side

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Building Construction
Slate

Splits into thin sheets along its bedding planes
Has a smooth surface and contains alumina and silica
Is a metamorphic rock
Possesses good water absorption capacity

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