Questions that start with when, why, where or what (and other similar words) demand reasoning and explanations. How and if are 'honorary' W question starters!
Here are some examples of W questions and question starters.
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Why?
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How do you know?
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What if …?
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What if … not …?
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Where would …?
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When could …?
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If …
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If … then …
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How could we …?
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What could …?
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What explanation could you give …?
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When is …?
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What if …?
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What do you think about …?
Surface area and scaling up
W questions are applied to an activity about surface area and scaling up.