Question

1. indicate the direction a substance with less density will move.

options: up, down

Explanation:

Step1: Recall Density and Buoyancy

Substances with less density than the surrounding medium experience an upward buoyant force (Archimedes' principle). For example, oil (less dense) floats on water (more dense), moving up.

Step2: Apply to the Question

A substance with less density will move up relative to a denser medium (like in a fluid, less dense objects rise). So the correct direction is "up".

Answer:

A. up (assuming the first option is "up" as per the visible text "up" in the options)