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Experiment

The Big Ice Excavation

Freeze small toys inside a large ice block overnight, then spend an afternoon chipping and melting them free.

Ages 5–1230–60 min1–3 kids

Freeze a handful of small toys inside a large container of water overnight to make one big ice block. The next day, hand over spoons, warm water, and salt to melt and chip the toys free — a longer, more physically demanding version of a quick ice-melt activity, built for a kid who wants a real project.

What you need

  • a large plastic container or bowl
  • small toys or objects
  • water
  • spoons
  • warm water
  • salt (optional)

How to do it

  1. 1The night before, fill a large container with water, drop in several small toys, and freeze overnight.
  2. 2Once frozen solid, pop the ice block out of its container and set it on a tray.
  3. 3"Free every toy — spoons, warm water, and salt are your tools." Let them figure out which works fastest.
  4. 4Compare methods: does salt melt faster than warm water? Does chipping work better on thin or thick ice?

Variations

  • If a whole day is too long to wait: freeze several smaller ice blocks in muffin tins instead for a shorter, same-day version.
  • How it ends: the last toy freed is the natural finish — line up all the rescued toys as a small trophy display.

💡 Parent tip

This is a full-afternoon project, not a five-minute filler — plan it for a day with time to spare, not a five-minutes-before-dinner gap.

What your child develops

  • Comparative experimentation — testing which melting method works fastest is real scientific thinking
  • Persistence — a longer, harder task than most sensory play, building tolerance for sustained effort
  • Cold-water tactile tolerance — a genuinely different sensory input than most indoor play offers

Safety notes

  • Ice can be very cold on skin for extended contact — offer a towel to dry hands periodically. Supervise use of salt near eyes.

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