You are now a little more than halfway in the class, and you are familiar with t

Question

You are now a little more than halfway in the class, and you are familiar with the basic concepts of geology, and with the methods that scientists employ to investigate the large number of geologic 1hat n.ia..ea 1.aa You have learned that the most important theory in gcology is Plate Tectonics, and you have examined most of what is needed to understand how Plate Tectonics works. It should be evident that all this is based on data collected and examined by researchers But how are these data used to investigate and measure how Plate Tectonics actually unfolds on Earth, how continents moves, or mountains are built? It turns out that to do that you need to describe the motion of plates in mathematical terms. This can be quite complicated, because plates move on a spherical earth, and the mathematical and geometrical knowledge required to do the calculations can be challenging. However it is possible to represent Earth's surface on a plane instead of a sphere, and to represent the plates as flat surfaces, with the boundaries presented as straight lines. This greatly simplifies the calculations. We will use this approach here to investigate plate motion and plate interaction. Look at the pictures on the right I took a piece of paper and cut a triangle inside (Fig. D)Now B have a model that is made up of two plates, A and B. In Fig. 2, I move my plate B in the direction marked by the arrow. Now imagine that these two plates are lithosphere, and that B is the more dense, while A is b the less dense. Recall what you studied in the previous lessons (especially Lesson 2). If plate B moves relatively to plate A (i.e. the two plates are diverging), a "crack" must form along the ab side of the triangle, revealing "something" that lays beneath the lithosphere. Along the sides ac and be of the triangle, the two plates are converging 3 Now examine Fig. 3 and answer the following questions: 1. 2. 3. What can we see beneath the lithosphere in the shaded area? What is forming along the ab side of plate B? What is forming along the ac and be sides of plate B? 4What is the reason for your answers to questions 2 and 3? HINT: To answer the previous questions you have to focus on the direction of motion of plate B. For the purpose of this exercise plate A does not move. Also consider what you know A about the "properties" of plate A and B, and recall what you studied. What happens when plates diverge or converge, or slide past cach other? Which kind of boundary forms between the two plates as a consequence of a particular movement?

Explanation / Answer

Ans. Different plates boundary situation listed below

1 Beneath the lithosphere magma rises.

2 Mid oceanic ridge forming.

3 Subduction or obduction occuring.

4 Movements of plates like divergent and convergent.

5 Sliding of plates occuring.

6 divergent of plates

7 collision occuring

8 sliding of plates

9 transform fault plate boundary occuring

10 subduction of plates

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