Cycles, Biomes, and Human Effects
Ecology zooms out to the largest scales too: the great cycles that move water and nutrients around the planet, the major regions called biomes, and the ways humans reshape them. This topic ties the pieces of ecology into a whole-Earth picture, and it is increasingly common on science tests.
This lesson covers matter cycles, biomes, and human impact.
Matter cycles, such as the water, carbon, and nitrogen cycles, move essential materials through ecosystems again and again. A biome is a large region defined by its climate and the community of life it supports, such as a desert or rainforest. Human activities can disrupt these cycles and biomes through pollution, habitat loss, and climate change.
What are the matter cycles?
Unlike energy, which flows through and leaves, matter is recycled. In the water cycle, water evaporates, condenses into clouds, falls as precipitation, and returns to the sea. In the carbon cycle, carbon moves between the air, living things, and the ground as organisms photosynthesize, breathe, and decompose. In the nitrogen cycle, nitrogen passes from the air through soil bacteria into plants and animals and back again. These cycles keep the same atoms in use across generations of life.
What is a biome?
A biome is a large geographic region with a characteristic climate and a community of plants and animals adapted to it. Major biomes include tropical rainforest, desert, grassland, temperate forest, taiga, and tundra. Two factors, temperature and precipitation, largely determine which biome forms in a given place, which is why deserts are hot and dry while tundra is cold and treeless.
| Biome | Climate |
|---|---|
| Tropical rainforest | Warm and wet |
| Desert | Hot and dry |
| Tundra | Cold and dry |
How do humans affect ecosystems?
Human activities can disrupt both cycles and biomes. Burning fossil fuels adds carbon dioxide to the air and drives climate change. Clearing forests causes habitat loss and reduces biodiversity. Pollution damages water and soil, and overuse strains resources. Understanding these effects is the first step toward conservation, the effort to protect ecosystems and use resources responsibly.
Watch: A Short Video Lesson
Queen Nerdling walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A routine for cycles and biomes questions
- For a cycle, name the material being recycled: water, carbon, or nitrogen.
- Remember matter is recycled, while energy flows through and leaves.
- For a biome, use temperature and precipitation to identify it.
- For human effects, connect the activity to its impact (fossil fuels to climate change, clearing land to habitat loss).
- Link the impact to conservation solutions.
Practice questions
- Name two of the major matter cycles.
- What two climate factors mainly determine a biome?
- Which biome is hot and dry?
- How does burning fossil fuels affect the atmosphere?
- What is one human activity that causes habitat loss?
- True or false: matter, like carbon, is used only once and then lost.
Answers:
- Any two of: the water cycle, the carbon cycle, the nitrogen cycle.
- Temperature and precipitation.
- Desert.
- It adds carbon dioxide, contributing to climate change.
- Clearing forests for farming or building.
- False. Matter is recycled through ecosystems again and again.
Where this fits
Cycles and biomes complete the ecology group alongside ecosystems, habitats, and niches and energy flow and the cycles of matter. Human effects on climate connect to climate and the greenhouse effect. Find all topics on the ASVAB General Science Learning Hub.
Recommended Prep Books
These study guides and practice books help you keep building momentum as you prepare:
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