Here are case studies to review referenced by the AICE syllabus. Yes, I will be using Wikipedia in most cases, since you will not need to reference an article and the information will be quicker to learn that way. If there are many listed, you can just pick 2, just make one is from a MEDC and one is from a LEDC for contrast.
Lithosphere
Earthquakes - Mexico City (1985), Armenia (1988), Loma Prieta (1989), Colombia (1999), Sumatra (2009), Haiti (2010)
Volcanoes - Ruapehu (1965, 1975, 1995), Mt. Unzen (1991), Pinatubo (1999), Montserrat (1995), Etna (2001), Grimsvotn Jokulhlaup (1996)
Mass Movements - Hong Kong, Rio de Janeiro, Sarno, Himalayan Foothills, Sumatra
Soil Deterioration/Erosion - Southern England, Himalayan Foothills, USA Dustbowl
Soil Profiles - Temperate podzols & brown earths, tropical laterites, rainforest soils
Energy Resource Use/Policies - MEDC - Germany, France LEDC - India
Urban Sprawl - Sao Paulo, India, London, Tokyo, Paris, Buenos Aires, Lagos
Atmosphere
Hurricanes - Katrina, Irma, Maria, Michael
Drought - California, Ethiopia, Sudan, Australia, Pakistan
Air Pollution Problems/Remedies - UK, Athens, Beijing, Los Angeles
International Meetings/Agreements - Kyoto, Buenos Aires, Rio de Janeiro
Hydrosphere
Aquifers - Australian Basin, Floridian Aquifer, Ogalalla Aquifer
Diminishing Water Supplies - Aral Sea, Australian Artesian Basin, Mexico City, Middle East, London Basin
Water Storage & Use - Colorado River, Three Gorges Dam, Nigeria, Ghana, Desalination in the Persian Gulf
Water Pollution - Rhine, Ganges, Mediterranean Sea, BP Oil Spill, Exxon Valdez
Biosphere
Biomes/Ecosystem Structure - Amazon Rainforest, Arctic Tundra, India Monsoon Rainforest, Sahara Desert, US Deciduous Forests, African Tropical Savanna
Disruption/Destruction of Ecosystems - Amazon Rainforest, Great Barrier Reef, Galapagos Islands
Conservation of Biodiversity - Yellowstone National Park, Everglades National Park, Costa Rica, WWF, International Protocols - Rio de Janeiro, Montreal, Kyoto, Bali
Population Growth - Mauritius (go to demographic profile section), India, UK, China, Canada, Australia, Green Revolution