Earth’s Life-Support System
The thin layer of air around Earth.
What is the atmosphere?
The living parts of an ecosystem are called this.
What are biotic factors?
A simple line showing “who eats who.”
What is a food chain?
The cycle that moves water through clouds, rain, rivers, and oceans.
What is the water cycle?
The top layer of soil that plants need to grow.
What is topsoil?
he three things that keep life going on Earth: energy from the sun, cycling of nutrients, and ______.
What is gravity?
Plants and algae that make their own food.
What are producers?
A bigger map of many food chains combined.
What is a food web?
The cycle that moves organic compounds through the air, plants, animals, and back.
What is the carbon cycle?
When soil gets washed or blown away.
→ What is erosion?
This “blanket” of gases traps heat and keeps Earth warm.
What is the greenhouse effect?
Animals that eat other organisms for food.
What are consumers?
About how much energy passes from one level to the next (like from plants to herbivores)?
What is 10%?
The nutrient that helps plants grow but can pollute water if there’s too much.
What is phosphorus (or nitrogen)?
Gross primary productivity (GPP) is the rate at which ____.
What is producers convert radiant energy into chemical energy?
The four “spheres” of Earth (air, water, land, life).
What are atmosphere, hydrosphere, geosphere, and biosphere?
Mushrooms and bacteria that break down dead stuff.
What are decomposers?
The process plants use to turn sunlight into food.
What is photosynthesis?
The process in which nitrogen turns grass green.
What is lightning fixation?
The term for Earth’s “goods and services” like soil, water, and clean air.
What is natural capital?
Energy comes in, gets used, and then leaves Earth as this.
What is heat?
A group of the same kind of organism living together.
What is a population?
Photosynthesis is performed by ____.
What are autotrophs.
A way humans change the carbon cycle (name one).
What is burning fossil fuels / cutting down trees?
What would happen if decomposers disappeared?
What is waste would pile up and nutrients wouldn’t recycle?