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Discovery Rangers

Antarctica's Hidden Melt: Warm Water Under Ice Shelves. Ranger Mission

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Earth & NatureRanger MissionAges 4-12 · 2 min

Antarctica's Hidden Melt: Warm Water Under Ice Shelves

A hands-on field mission for the Discovery Rangers episode.

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In our Antarctica episode, we learned that warm ocean water is melting ice shelves from underneath. This Ranger Mission will help you see how that happens right in your own kitchen!

The Big Question

How can warm water melt ice from below, even if the air is cold?

What You'll Need

  • A clear glass or jar
  • Water (room temperature is fine)
  • Ice cubes
  • A few drops of food coloring (optional)
  • A spoon or dropper

Mission Steps

  1. Prepare the Ice. Fill your clear glass about two-thirds full with water. Carefully place a few ice cubes into the water.
  2. Add Color (Optional). If you have food coloring, carefully add a few drops to the water around the ice cubes, not directly on them. The goal is to color the water, not the ice itself.
  3. Observe the Melt. Watch the ice cubes closely for a few minutes. What do you see happening to the ice? Where is the water that is melting off the ice going?
  4. Simulate Warm Water. Now, using a spoon or dropper, carefully add a small amount of slightly warmer water (like from a warm tap, not hot!) to the bottom of the glass, trying not to disturb the ice too much.

Talk About It

  • What did you observe happening to the ice cubes in the cold water?
  • When you added the slightly warmer water to the bottom, did it change how the ice was melting?
  • How is this like warm ocean water melting Antarctica's ice shelves from below?

Take It Further

For older Rangers, try this: Can you think of any ways that the shape of the land under the ice shelves might affect how the warm water reaches the ice? Maybe a wall or a channel could direct the warm water, or maybe it could get trapped.

FAQ

Q: Will the ice melt completely? A: It depends on how long you watch and the temperature of the water. The goal is to observe the melting process and the effect of the warmer water at the bottom. Q: Is tap water warm enough to be dangerous to the ice? A: No, just use slightly warm tap water, not hot. The idea is to show a temperature difference, not to melt the ice quickly.

The Ranger Field Mission

Works after any episode · Any age · No equipment

Run this after every episode to turn listening into something your child actually keeps. Do as many steps as they have energy for — even one counts.

  1. 1

    Say it back

    Before snacks or screens, ask your Ranger to teach you the one big idea — as if you'd never heard it.

  2. 2

    Find it in the wild

    Hunt for one real example of today's idea — in the kitchen, the yard, the sky, or the sidewalk. Point at it and name it.

  3. 3

    Make something

    Draw it, build it from what's on the table, act it out, or record a 20-second “Ranger report.” Making it forces real understanding.

  4. 4

    Ask the next question

    Finish with “What's one thing the episode didn't answer?” Stick it on the fridge — that's the start of the next adventure.

Keep exploring

This mission is part of Parenting With Purpose - free tools that turn everyday moments into real learning. Browse every episode in the Library or open the Discovery Rangers podcast.

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