This term describes any living thing, from animals to plants to tiny bacteria.
What is an organism?
This shows the direct path of energy as one organism eats another.
What is a food chain?
This is the cycle where water evaporates, condenses, and falls as rain.
What is the water (hydrologic) cycle?
This natural process keeps Earth warm but can become a problem when there’s too much of it.
What is the greenhouse effect?
Cutting down large areas of trees is called this.
What is deforestation?
When a group of the same species lives in one area, it’s called this.
What is a population?
This shows how food chains connect and overlap in an ecosystem.
What is a food web?
This cycle shows how carbon moves through living things, the air, and fossil fuels.
What is the carbon cycle?
This clean energy source comes directly from sunlight.
What is solar energy?
When cities grow and spread into natural areas, it’s called this.
What is urbanization?
When different species live and interact in the same area, it forms this.
What is a community?
This tells you the level an organism is in the food chain, like producer or top predator.
What is a trophic level?
This cycle moves nitrogen through the air, soil, and living things.
What is the nitrogen cycle?
This energy comes from heat stored deep inside the Earth.
What is geothermal energy?
This kind of air pollution makes the air hazy and hard to breathe.
What is smog?
This is the name for all living and nonliving things in one environment working together.
What is an ecosystem?
If this kind of species disappears, it could cause the whole ecosystem to change or fall apart.
What is a keystone species?
This is the process of oxygen moving through the air, animals, and plants.
What is the oxygen cycle?
This powerful energy is created by splitting atoms in a reactor.
What is nuclear energy?
When harmful chemicals or trash enter rivers, lakes, or oceans, it’s called this.
What is water pollution?
This is the part of Earth where life exists — land, water, and air included.
What is the biosphere?
This gas, produced by animals and landfills, helps trap heat in Earth’s atmosphere.
What is methane?
This big term refers to how important materials (like water, nitrogen, and carbon) cycle through nature.
What is the biogeochemical cycle?
This is a long-term change in Earth’s climate, caused by things like pollution and greenhouse gases.
What is climate change?
This happens when more and more people are born, putting stress on Earth’s resources.
What is human population growth?