Answer for Short Quiz 2

1. Annotated diagram to show the characteristics and landforms in the middle course of a river

-- students should be able to label the following:

-- winding river in the middle course

-- convex/concave bank

-- erosion on concave bank due to fast flowing water

-- deposition on convex bank due to slow flowing water

-- bluff/river cliff

-- slip-off slope

-- asymmetrical cross-section (any 6)

2. weathering process

-- block disintegration

-- in well-jointed rocks/granite

-- heating during daytime --> expansion

-- cooling at night --> contraction

-- alternate expansion and contraction

-- creates stress on rocks

-- cracks are widened

-- rocks break up block by block (any 6)

3. chemically-weathered rocks

-- by rainwater

-- under high temperature

-- through the processes of hydration/hydrolysis/oxidation/carbonation/solution (any 2 --> 2 marks)

-- e.g. spheroidal weathering/honeycomb weathering (any 3)