Board Thread:Off-Topic Activities/@comment-36387203-20190827233829/@comment-36387203-20190828232047

Additions

 * I add a wooden boat toy to Box A.
 * I add an iron ball with radius of 3 centimeters to Box C'.

Events/Processes

 * Water in Box A became hot.
 * In 9 posts, lava in Box B will be solid.

Contents
Box A Box B Box C
 * 1 liter of hot water (80℃)
 * A wooden boat toy floating on water
 * 1 liter of lava
 * Solidifying (1/10)
 * An iron ball (Φ3cm)