Standard Science Primary 4 Energy

Gaps are left between the concrete slabs on a pavement. What is the purpose of these gaps?

A To allow for expansion on hot days.
B To let water drain away.
C To save on concrete materials.
D To make the pavement look nicer.
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Worked Solution

Step 1: Concrete is a solid that expands when it gains heat. Step 2: On hot days, slabs will expand. Step 3: Gaps prevent the slabs from pushing against each other and cracking.

Correct answer: To allow for expansion on hot days.

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