World Biomes
Middle School
Definition
Large regions of the Earth defined by their climate and the communities of plants and animals adapted to it, such as tropical rainforests, deserts, grasslands, and tundra. Biomes shape how people live and use the land within them.
Worked examples
The Amazon rainforest in South America is a tropical rainforest biome with year-round warmth, heavy rainfall, and dense vegetation supporting jaguars, sloths, and countless plant species.
Climate and adapted life forms together define this biome and shape how indigenous peoples live there.
The Sahara Desert biome has extreme heat, very little rain, sparse vegetation like cacti, and animals such as camels adapted to conserve water.
Desert biomes limit agriculture and settlement, so people rely on oases and nomadic herding.
The Arctic tundra biome features freezing temperatures, permafrost, low shrubs, mosses, and animals like caribou and polar bears adapted to cold.
Tundra biomes influence traditional lifestyles like hunting and require special building techniques.
Common mistakes
- Biomes are small areas like a forest or a single desert. → Biomes are large regions spanning continents with similar climate and life forms. A biome includes all tropical rainforests worldwide, not just one forest.
- Only temperature defines a biome. → Both climate (temperature and precipitation) and adapted plants and animals define a biome. Rainfall patterns are just as important as temperature in shaping biomes.
- All deserts are hot. → Deserts are defined by low precipitation; some, like cold deserts and polar deserts, are cold. Antarctica is technically a desert because it receives very little precipitation.
Where you'll use it next
You'll use biomes when studying ecosystems and biodiversity, analyzing how climate change affects habitats, comparing population distribution and economic activities across regions, and understanding conservation challenges in geography and environmental science.
See also
Human-Environment InteractionBiodiversity ConservationHuman GeographyNatural HazardsSustainable DevelopmentWater Resources
Reviewed by Pat Cheng, M.Ed. — StudyPug Curriculum Lead · Last updated June 6, 2026