For this Year 6 science project you will need:
What to do:
- Fill the jars with hot
- Add as much baking soda to each jar as will
- Mix well to dissolve the baking soda.
- Dip one end
of the wool in each jar, making sure the ends are weighed down by the
- Place the saucer or plate between the jars.
the thread hang between the jars, over the saucer.
- Leave for 2-3
A white stalactite grows down from
the wool and a stalagmite grows up from the saucer.
The baking soda mix is carried up through the wool. This is
called capillary action. The mix then drips onto the saucer. Over the
days, the dripping water evaporates, leaving a little of the baking soda
behind. These bits of baking soda make a tiny stalactite and stalagmite.
After a few months, these will join to make a single column like the ones
you might see in a cave.