Germany Jahrgangsstufe 12 Geography
Chapters: 7
1. Geographic techniques for years 12-13
Geographic methods
- Map Skills: Reading and Using Maps – A map is a flat, scaled-down view of a place from directly above. To read one you need: the key (symbols), the scale (to measure distance), direction (compass points and bearings), grid references (to find and give a location) and contour lines (to see height and slope). Today GPS finds our position from satellites, and GIS stacks many map layers of data on a computer to answer questions about places.
2. Climate and climate change processes
Climate and climate change
- Climate Change and the Greenhouse Effect – Climate is the average weather of a place over about 30 years. Greenhouse gases like carbon dioxide and methane trap some of the heat the Earth gives off. Humans have added a lot more of these gases by burning fossil fuels and cutting forests, so the Earth is warming. This causes melting ice, rising seas and more extreme weather. We can cut emissions (mitigation) and prepare for changes (adaptation).
3. Human-environment relations in the tropics
Tropical ecosystems and sustainability
- Tropical Rainforests: Life in the Hot, Wet Forest – Tropical rainforests grow near the equator where it is hot (about 27 °C) and very wet (over 2,000 mm of rain a year) all year. The forest has layers: emergent, canopy, under-canopy and shrub layer, and forest floor. Plants adapt with buttress roots, drip-tip leaves, lianas and epiphytes; animals adapt with camouflage, climbing and special diets. Nutrients cycle fast, so the soil is thin and poor. Deforestation for farming, cattle, logging, mining and roads causes soil erosion, loss of biodiversity, climate change and harm to local people. Sustainable management (selective logging, replanting, agroforestry, ecotourism, protected areas, international agreements) uses the forest without destroying it.
4. Polar regions: climate research and geopolitics
Polar regions: climate and geopolitics
- Polar Regions: The Arctic and Antarctica – The polar regions lie around the North and South Poles, roughly inside the Arctic and Antarctic Circles (66.5°). The Arctic is a frozen ocean ringed by land; Antarctica is a continent buried under an ice sheet up to about 4 km thick. They are cold because sunlight arrives at a low angle and spreads out, and because white ice reflects most of it. The 23.5° tilt of Earth's axis gives months of daylight (midnight sun) and months of darkness (polar night). Plants are few; animals such as polar bears (Arctic) and penguins (Antarctica) are adapted with fat, fur and feathers. Indigenous peoples like the Inuit and Sami live in the Arctic; Antarctica has only scientists. Ice cores record past climate. The poles are warming fast; melting sea ice speeds warming (albedo feedback) and melting land ice raises sea level. The Antarctic Treaty keeps Antarctica for peace and science, while Arctic sea routes and resources raise new questions of cooperation.
5. Resource conflicts in European mid-latitudes
Resources in Europe's mid-latitudes and subtropics
- Water Resources – Almost all water on Earth is salty sea water; only a tiny part is usable fresh water. Growing population, farming, industry and pollution cause water scarcity. Multipurpose dams store water for many uses but also create problems. Rainwater harvesting is an old and simple way to save water.
6. Use and vulnerability of high mountains
High mountains: use and vulnerability
- How Mountains Form and Why They Are Fragile – Fold mountains rise where two plates push together and squeeze rock layers into folds. High mountains are steep and cold, so they suffer landslides, avalanches, glacier retreat and permafrost thaw. Tourism and big projects bring money but add pressure.
7. Natural disasters and risk research
Natural disasters and risk research
- Distribution of Oceans and Continents: Drift, Spreading and Plates – In 1912 Alfred Wegener said all continents were once one landmass, Pangaea, surrounded by one ocean, Panthalassa, and that they drifted apart. Matching coastlines, rocks, fossils, glacier deposits and placer gold supported him, but he could not explain the force. Mapping the ocean floor showed ridges, plains and trenches; Harry Hess then proposed sea-floor spreading: new crust forms at mid-ocean ridges and old crust sinks at trenches. This led to plate tectonics: the lithosphere is broken into rigid plates that move on the soft asthenosphere and meet at divergent, convergent and transform boundaries. The Indian plate broke away from the south, moved north, and collided with Asia to raise the Himalayas.