Secondary 3 Geography Physical Geography Quiz

Secondary 3 Geography Quiz - Physical Geography (Answer Key)

Total Marks: 50

Section A: Climate Systems and Variations

1. Define climate and distinguish it from weather. [2]

• Climate: The average weather conditions (temperature, rainfall, etc.) of a place over a long period (usually 30+ years). [1]
• Distinction: Weather refers to short-term atmospheric conditions (daily/hourly), while climate is the long-term pattern. [1]

2. Explain why altitude causes temperature to decrease. [2]

• Air at higher altitudes is less dense/thinner. [1]
• There are fewer air molecules to absorb and retain heat radiated from the Earth's surface, leading to lower temperatures. [1]

3. Explain why Location A (windward) receives more rainfall than Location B (leeward). [3]

• Moist air is forced to rise over the mountain on the windward side (Location A). [1]
• As it rises, it cools, condenses, and forms clouds/rain (Relief Rainfall). [1]
• By the time the air reaches the leeward side (Location B), it has lost most moisture and warms up, creating a rain shadow effect with little rainfall. [1]

4. Identify and explain late afternoon rainfall in Singapore. [3]

• Type: Convectional Rainfall. [1]
• Process: Intense solar heating causes air to rise rapidly. [1]
• As it rises, it cools and condenses into cumulonimbus clouds, resulting in heavy thunderstorms. [1]

5. Explain how distance from the sea affects annual temperature range. [2]

• Land heats up and cools down faster than water (lower specific heat capacity). [1]
• Inland locations (far from sea) experience hotter summers and colder winters, resulting in a larger annual temperature range compared to coastal areas. [1]

Section B: Climate Change and Action

6. State two natural causes of climate change. [2]

• (a) Volcanic eruptions (release ash/gases blocking sun or CO2). [1]
• (b) Solar variations (changes in sunspot activity/solar output). [1]
  (Accept: Orbital changes/Milankovitch cycles)

7. Explain how deforestation contributes to the enhanced greenhouse effect. [3]

• Trees absorb CO2 during photosynthesis; fewer trees mean less CO2 is removed from the atmosphere. [1]
• Burning or decaying trees releases stored carbon back into the atmosphere as CO2. [1]
• Increased atmospheric CO2 traps more outgoing longwave radiation, enhancing the greenhouse effect. [1]

8. Differentiate between mitigation and adaptation. [2]

• Mitigation: Actions taken to reduce the causes of climate change (e.g., reducing emissions). [1]
• Adaptation: Actions taken to adjust to the impacts of climate change (e.g., building sea walls). [1]

9. Describe one adaptation strategy in Singapore for rising sea levels. [2]

• Strategy: Raising the minimum land reclamation levels (e.g., to at least 4m above sea level). [1]
• Explanation: This ensures new land is high enough to withstand projected sea-level rise and storm surges. [1]
  (Accept: Coastal protection works like sea walls or polders)

10. "Individual actions are too small..." Do you agree? [2]

• Opinion: Agree/Disagree (Must be stated). [1]
• Reason: E.g., Disagree: Collective individual actions (e.g., reducing waste) create market demand for sustainable products and lower overall carbon footprints significantly when scaled up. [1]
  (Accept valid reasoning for either side)

Section C: Plate Tectonics

11. Name the layer where convection currents occur. [1]

• Mantle (specifically the Asthenosphere/Upper Mantle). [1]

12. Describe plate movement at a divergent boundary. [2]

• Two plates move away from each other. [1]
• Magma rises from the mantle to fill the gap, creating new crust. [1]

13. Explain why volcanoes form at oceanic-continental convergent boundaries. [3]

• The denser oceanic plate subducts (sinks) beneath the lighter continental plate. [1]
• Friction and heat cause the subducting plate to melt, forming magma. [1]
• The magma is less dense and rises through cracks in the continental crust to erupt as volcanoes. [1]

14. How do fossils support Continental Drift? [2]

• Identical fossils (e.g., Mesosaurus) are found on continents now separated by oceans. [1]
• These organisms could not swim across oceans, suggesting the continents were once joined together. [1]

15. Identify the plate boundary of the Mid-Atlantic Ridge. [1]

• Divergent Plate Boundary (Constructive). [1]

Section D: Geological Hazards and Risk Management

16. Define primary hazard and give an example. [2]

• Definition: The direct result of the geological event itself. [1]
• Example: Ground shaking / Ground rupture / Lava flow. [1]

17. Why do shallow-focus earthquakes cause more damage? [2]

• The seismic waves have less distance to travel to the surface. [1]
• Therefore, they lose less energy before reaching the surface, resulting in stronger shaking. [1]

18. Explain how improving capacity reduces disaster risk. [2]

• Capacity refers to the ability to cope (e.g., emergency services, education, savings). [1]
• Higher capacity means communities can respond faster and recover quicker, reducing the overall impact/risk. [1]

19. Compare impact in MEDC vs LEDC focusing on building standards. [3]

• MEDC: Strict building codes and earthquake-resistant designs (e.g., cross-bracing) prevent collapse, saving lives. [1]
• LEDC: Poor enforcement of codes or use of weak materials (unreinforced masonry) leads to building collapse. [1]
• Result: Higher mortality and injury rates in LEDCs for the same magnitude event. [1]

20. Suggest one preparedness measure for volcanic eruptions. [2]

• Measure: Establishing evacuation zones and routes. [1]
• Explanation: Allows for the orderly and rapid movement of people away from danger zones (pyroclastic flows/lahars) before or during an eruption. [1]
  (Accept: Emergency drills, stockpiling supplies, monitoring systems)