Cycle of Matter

What happens in the water cycle?

• Water moves from the earth to the atmosphere and back

• Carbon moves from the producer to the consumer

• Humans ruin the planet

• Carbon levels rise causing it to rain

Where do the producers get the carbon dioxide they need?

• water during the water cycle

• air during photosynthesis

• soil from decomposers

• humans when they eat

What is the role producers in the carbon and oxygen cycles?

• to eat trees and turn them into carbon dioxide

• to take in water and release it back to the ecosystems

• affect the amount of oxygen another producer has

• take in carbon dioxide during photosynthesis and release oxygen during photosynthesis

In what three places is Nitrogen found?

• water, plants, and people

• clouds, sunlight, and space

• soil, air, and living things

• animals, trees, and clouds

By what process do bacteria turn nitrogen into a usable form?

• Nitrogen Fixation

• Carbon Cycle

• Water Cycle

• Photosynthesis

What organisms return simple nitrogen compounds to the soil?

• producers

• consumers

• decomposers

• herbivores

If nitrogen isn't __________, then most organisms cannot use it

• free

• flowing

• sitting

• fixed

Nitrogen compounds become available to organisms _________________________.

• in the plants

• in the air

• in the soil

• in the water

Producers, consumers, and decomposers all play a role in recycling ______________ and ________________.

• paper and plastic

• carbon and oxygen

• oxygen and nitrogen

• plants and animals

Some human activities release __________ compounds into the air.

• water

• nitrogen

• soil

• carbon