Standard Science Primary 4 Energy

Why are there small gaps (expansion joints) left between concrete slabs on a pavement?

A To allow for the concrete to expand on hot days without cracking.
B To save money on concrete.
C To allow water to drain away.
D To make the pavement look better.
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Worked Solution

Step 1: Concrete is a solid that expands when it gains heat from the sun. Step 2: Without gaps, slabs would push against each other and crack. Step 3: The gaps provide space for expansion.

Correct answer: To allow for the concrete to expand on hot days without cracking.

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