Extracted text: a. State how topography and vegetation control mechanical weathering. b. Briefly explain at least two (2) parameters that control chemical weathering. c. Briefly explain two strategies suitable to reduce costal hazards in Trinidad. d. What is Concave slope/waning slope? Describe with a diagram, how concave up slope is more dangerous than convex up slope. e. If shear stress along a plane is 3.469 x 10" Pa cohesion between the two sides of the discontinuity is 1.2x 1011 Pa, stress acting normal to the plane of discontinuity is 0.25 x 10 6 Pa, and water pressure in the discontinuity is 2.31 x 10* Pa. Find out the angle of frictional resistance (4s) attributed to the plane of movement. Hint: S = C, + (o – u) tan o,