You are building a shelf at home. as you sand the wood dust floats into the air. the air and dust from sanding create which of the following.
a. a solution
b. a pure substance
c. a colloid
d. a suspension

A colloid and a suspension are the same thing so it rules out c and d because the dust is heavier than air causing it to float down but not float constantly. a pure substance is one solid substance. so its be A. a solution. a solution is a homogenous mixture of 2 or more substances because it wouldn't only compose of wood dust because of the air oxygen and carbon dioxide keeping it from falling faster.