EJC Prelim_H2_GEO_Mark_Scheme

Eunoia Geography Unit JC2 H2 Geography Prelims Examination 2018 Marking Scheme for JC2 H2 Geography Prelims Section A – Tropical Environments 1 (a) (b) Explain the factors influencing rainfall distribution in the humid tropics Indicative Content Candidates should consider both the spatial and temporal rainfall variations that exists across the humid tropics. Responses should describe the variations across the 3 climatic types (Af, Am & Aw). Fact ors to explain these variations should include global scale like migration of ITCZ, ENSO, Monsoons and localized scale like relief/topographic effects on onshore wind flow. A higher level response wi ll offer detailed explanation of the factors focusing on ITCZ, seasonal variation of monsoonal winds and at least localized factor accompanied by well annotated diagrams (e .g. location of ITCZ on the World Outline Map, ENSO, formation of or ographic rain. Responses that make reference to places in the climatic zones should be credited with higher marks. Levels marked using H2 generic level descriptors for 12m SEQ sub-part (a) The interplay of climate and geology explains the variation in the karst landscapes in the humid tropics.’ Discuss this statement with support from relevant diagram(s). Indicative Content Karst landscapes in the humid tropics have characteristic surface and sub surface morphology as a result of the interaction between water and geology. Candidates should demonstrate the movement of both surface water (rivers) and sub-surface river and water and the dissolution proce sses of the rock type (limestone or dolomites) and rock structure. A variety of surface landforms such as cone, tower and isolated karst and surface landforms such as cave and speleothems could be used to illustrate the movem ent of water affect the geology or vice versa. Other factors that could influence the karst landforms could be tectonic uplift, vegetation and time. A higher level response should demonstrate the differential erosion by water on the soluble rock guided by secondary perm eability of the rock structure. This is evident through the varied landforms found in the landscapes. Evidence of the varied landscapes can be seen. The count er argument to the statement could examine the present of ot her factors such as tectonic uplift in changing the dynamic of solution processes to enhance t he forms of the landforms over time. Reference to concrete examples of kars t landscapes in Guilin, China or Vietnam and Malaysia should be credited. A good response could use the carbonation equation to demonstrate the dissolution of limestones in sub-aerial to shape the landscapes and movement of water in sub-surface especially in cave resulting in varied forms of speleothems. [12] [20]

Eunoia Geography Unit JC2 H2 Geography