Volcano Shapes

Yesterday we had a science lesson on our topic, volcanoes. In this lesson we were investigating whether the viscosity of lava effected a volcanoes shape. To be able to tell if this was true we decided to do an experiment, although we obviously couldnt use real lava so instead we used a mix of flour and water.

To test many different types of viscosity we had 3 different mixtures of the liquid with different amounts of water. There was a high viscosity liquid which had 3 and a half tablespoons of water, a medium viscosity liquid which had 3 and 3 quaters of a tablespoon of water and finally a low viscosity liquid with 4 tablespoons of water.

We then conducted the experiment which consisted of pouring each liquid onto a plate and then after timing it for two minutes we would see how far it had spread out by measuring the circumfrance of the liquid which had then formed a circle. Our results from this was that the high viscosity liquid had the smallest cricumfrance because it was thicker and didnt get the chance spread out as much as the low vicostity liquid which was much thinner and had the largest circumfrance.

The way our experiment tied in with the effect of the viscosity of a lava on the shape of the volcano is that the lava with high viscosity would have a higher shaped volcano because it doenst flatten as much as the low viscosity lava whcih would be in a more spread out shaped volcano.

Over all, I very much enjoyed this lesson and it really helped me understand everything better by doing the experiment and seeing it with my own eyes.




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