(2) 5. Why is the apparatus not an accurate represent on the mechanism of breathing in humans(compare the bell jar with the ribs and intercostal muscles it represent) (3) 6. Describe what happens to the following when the rubber sheet is pulled downwards: 6.1 The top to bottom distance (2) 6.2 The volume within the bell jar (2) 6.3 The pressure within the bell jar (2) 7. Discuss why the balloons inflate when the rubber sheet is pulled downwards and deflate when the rubber sheet goes back to its normal position. Explain your answer in terms of volume and pressure that take place within the bell jar (8) Grand total=30

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary