Edexcel GCSE Geography A · 1GA0
Specification 3.4, 3.6 · Paper 1
Revise: Tropical Rainforest FeaturesThe Gersmehl model represents these stores and transfers. Larger circles represent larger nutrient stores; arrows show the direction of movement, with thicker arrows representing larger transfers. Inputs and losses show that the cycle is not completely closed: precipitation can bring nutrients into the ecosystem, weathering releases nutrients from rock, and leaching and surface run-off remove nutrients.
- Revise: Deciduous Woodland Features
A model showing nutrients stored in biomass, litter and soil, and the transfers between these stores.