Question

of the following substances, which one is the least dense? red, clear, blue red clear blue

Explanation:

Step1: Understand density concept

Density determines how substances layer. Less - dense substances float above more - dense ones.

Step2: Analyze the layering

In a density column, the top - most layer is the least dense. Assuming the clear layer is on top (common in such set - ups if no other info contradicts), clear is the least dense.

Answer:

clear