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My aims are to investigate the factors affecting Lava Flows.

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Introduction

Geology Coursework Introduction/Background information There are two types of lava flows, free flowing mobile lava and slow moving viscous lava. Free flowing mobile (basaltic) lava creates a vent and spreads to produce large broad cones called shield volcanoes. The slow moving viscous (rhyolite) lava creates a narrow steep-sided cone due to a different chemical composition to basalt and this makes the lava flows more slowly down the cone side. My Aims My aims are to investigate the factors affecting Lava Flows. There are lots of factors affecting a lava flow, they are: 1. Slope angle 2. Viscosity of the lava 3. Temperature of the lava 4. Slope height 5. Volume of lava 6. Roughness/smoothness of slope. I have decided to investigate the viscosity of the lava flow. I have chosen this because I can produce a good range of results and this seems like it will produce the most safe, fair and accurate results. This is very important to me. What will the viscosity affect on the lava flow? * Speed of the Lava * Distance traveled from the base of the volcano (slope). I have decided to use the speed as it will be the easiest to perform and it will not take as long to perform. This will allow my self to make more accurate results. So my aim is to investigate how the viscosity of lava changes the speed of the lava flow when purred down a shallow angle. ...read more.

Middle

=D/T 1 2 3 30 50 2.36 1.95 2.87 2.39 20.92 40 50 1.97 1.31 1.79 1.69 29.58 50 50 0.43 0.55 0.39 0.45 111.11 Conclusion and Evaluation I have found that the most appropriate slope angle is 30 and the worst slope angle is 50 because this will be hard to record the results. I am now going to continue doing the planning for my experiment. Apparatus * Drain pipe (volcano side) * Retort stand and clamp * Wallpaper powder * Water * Bowl * 100 cm ruler * Mixing rod * Stop watch * Two Beakers * Digital Scales * Protractor * Measuring Cylinder. Method First I need to collect all the apparatus. I have chosen this list because I think it will give me the most accurate results. Second clamp the drainpipe at the end so it is at an angle facing down (diagram). Before every experiment make sure that the angle is at 30 degrees. This will make it a fair test. Using the ruler draw a line from the edge of the pipe (at the bottom) 50-cm up. After every experiment make sure the line is 50-cm from the bottom. Using the digital scales measure out 100ml of water to a beaker. First collect over 100ml in a measuring cylinder. Put the beaker onto the scales and make sure it is at zero and that it weighs in grams. Purr in the water form the measuring cylinder into the beaker until it reads exactly 100 grams (ml). ...read more.

Conclusion

In my experiment I have proved that the lower the viscosity the faster the lava flows and vice versa. Evaluation In my aim I have said, "My aim is to investigate how the viscosity of lava changes the speed of the lava flow when purred down a shallow angle" and I have done it. I think that I have done an accurate test because I was able to produce a line of best fit for my graph and there seemed to be no failure? But there was an anomaly. This was probably due to the length at which the 'lava' was poured (55 cm not 50 cm). I did notice this at the time because I could not tell for the time. This could also be an improvement to do, make sure that the results looks O.K. on a graph before write up. I think that the experiment was fair (except for the anomaly) because I cannot see any reason for it to be unfair. I think I was limited in only two ways: 1. I did not have enough time to do the experiment in, I could have made sure of the anomaly. 2. Half way through the experiment I was shown a piece of apparatus that used magnetic fields to make a small piece of metal spin inside the beaker. This would have made the experiment more accurate and fair. To extend my project I could investigate all the other things I said in my aim like: * Slope angle * Temperature of the lava * Slope height * Volume of lava * Roughness/smoothness of slope. By Ashley Brookes ...read more.

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