Rainforests
Tropical rainforests are warm, wet and rich in species.
About this topic
Tropical rainforests lie near the equator, with warm temperatures (25-30 degrees C), heavy rainfall (over 2000 mm) all year, and high humidity. They cover only about 6% of land but hold over half of the world's plant and animal species, making them the most biodiverse habitats on Earth. Vertical layers: emergent trees, canopy, understorey and forest floor.
The canopy captures most sunlight, so the forest floor is dark and sparsely vegetated. Nutrients are cycled quickly in the biomass rather than stored in poor soil: fallen leaves rot within weeks and are absorbed by roots. This is why clearing makes land infertile after only a few harvests, as the nutrients leave with the trees and heavy rain washes the soil away. Plants show adaptations such as drip tips on leaves, buttress roots and lianas climbing toward the light.
Rainforests absorb carbon, produce oxygen and regulate rainfall, and they supply medicines, timber and foods. Threats: logging, cattle ranching, farming and mining. The Amazon, Congo basin and Southeast Asia contain the biggest areas. A common misconception is that the Amazon is the Earth's lungs; its trees do release oxygen, but they also use most of it, so its main global value is storing carbon and sustaining biodiversity and rainfall. Sustainable forestry and protected areas help conserve them.
Key ideas
- Layers: emergent, canopy, understorey, forest floor
- Nutrient cycle is fast
- Deforestation threatens them
Quick check
Use cases: where Rainforests helps
- Homework: review the key idea behind Rainforests before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Rainforests without notes.
- Visual learning: play with the interactive lab to see how Rainforests changes when you adjust its inputs.
- Teaching a friend: explain Rainforests in your own words, then compare your version with the key ideas.
Geography helps with city planning, climate, trade and migration.
Frequently asked questions
What is Rainforests?
Tropical rainforests are warm, wet and rich in species.
What will I learn in Rainforests?
Layers: emergent, canopy, understorey, forest floor. Nutrient cycle is fast. Deforestation threatens them.
Is Rainforests part of Geography?
Yes. It is one of 40 Geography topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Rainforests lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Rainforests?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.