Lab Report The structure of the earth is made up of many layers, but the crust and the upper mantle make up the lithosphere. The lithosphere is divided into individual sections called plates. The rest of the mantle makes up the asthenosphere. Convection in asthenosphere causes the plates to shift and move about. We can tell where the plates are or have been because volcanoes and earthquakes have their own boundaries when the are active. Tectonic plates have three relationships with each other. The have convergent boundaries when they collide, divergent boundaries when they move apart, and transform boundaries when they slide past each other. The friction and heat caused by the plates sliding all over the place causes volcanoes if it melts the rock and earthquakes if the plates slip while sliding away and towards each other. The purpose of this lab was for us to investigate and learn about the three different kinds of plates. The model was used just like any model; To help us understand the different plates and how they work. The model is a great way to help show something which is confusing to tell in words. The lab was to construct a model showing the different kinds of boundaries. First we needed three worksheets each with a different plate on it, and three tacks to hold the plates in place. With scissors we cut out the plates and then we stuck the tacks through designated holes. With everything in tact you could move the model and see how the three plates slid back and forth against each other. 1. Along the East Rise, the plates spread farthest apart in the south (apposed to the north) 2. A convergent plate boundary exists along the Aleutian Islands of Alaska and also along the Andes Mountains in South America. Since they are convergent boundaries, that means plates around these two areas are colliding. 3. It would take Los Angeles 19,444,444.44 years to reach the location that San Francisco is in now. .6 miles = 1km 350miles La to San Fran 583.33 km =350 miles 583.33/.00003 = 19,444,444.44 1cm = .00001km Although this model was very helpful, it wasn't accurate. First of all, the model didn't show all of the plates on the earth. I think it would be important to see all of the plates to fully understand the plate tectonic theory. The model also doesn't show convection in any way. Convection would be important to show in the model because it and the combined force of gravity's what really moves the plates of the earth. The model doesn't have much identified landscape. There are a couple volcanoes labeled, but there has to be more then one mountain range on the earth.