When we shared our photos and memories about ICELAND, our students were so much impressed by its volcanoes, waterfalls and geysers that they call it now NICELAND J. That is why, when we came up with our new Comenius activity – the scientific experiment – all of them wanted to make and see a volcano eruption and its bubbling lava.
Irina’s class has made a volcano.
Materials: vinegar, baking soda, transparent plastic cups, deep plates, red or yellow food colouring
1. Mix the vinegar with the food colouring.
2. Put one or two spoonfuls of baking soda in a transparent plastic cup.
1 3. Pour 100 ml of coloured vinegar onto the baking soda.
4. Watch how your volcano comes alive!
Cecilia’s class has made the volcano lava.
Materials: 1 liter plastic bottle, ¾ cup of water, vegetable oil, fizzing tablets (such as Alka Seltzer or effervescent calcium or vitamin C etc.), red food colouring
1 1. Pour the water into the bottle.
2. Slowly pour the vegetable oil into the bottle until it’s almost full. You may have to wait a few minutes for the oil and water separate.
3. Add 10 drops of food coloring to the bottle. The drops will pass through the oil and then mix with the water below.
4. Break an effervescent tablet in half and drop the half tablet into the bottle. Watch it sink to the bottom and let the blobby greatness begin!
To keep the effect going, just add another tablet piece. For a true lava lamp effect, shine a flashlight through the bottom of the bottle.