5 th Hour Your “Do Now” Copy down learning target #5 5) I can describe and explain the importance of the carbon and nitrogen cycles to life on earth Finish the notes from up front (copy filled in up front) Work on the practice assignment—due at end of hour. MUST DO TWO OF THE CHOICES FOR #6

Your “Do Now”4/24 Copy down the definitions of these terms on Notes 5 Community: a group of living things interacting with each other Ecosystem: A community of organisms interacting with the environment Learning Target #5 (write when finished) 5) I can describe and explain the importance of the carbon and nitrogen cycles to life on earth

Observations (no notes) ezg&feature=iv&annotation_id=annotation_ ezg&feature=iv&annotation_id=annotation_ _BVbGc _BVbGc ages/soilhealth_organic_carbon-cycle ages/soilhealth_organic_carbon-cycle

Agenda4/24 Carbon Cycle / Notes #5 Practice

CH 8 Notes #4 Carbon Cycle Community: a group of living things interacting with each other Ecosystem: A community of organisms interacting with the environment

Ecosystems are made of two parts: biotic and abiotic Biotic = parts of the environment that are living Ex: birds, grass, insects, bacteria Abiotic = parts of the environment that are non-living. Ex: rocks, water, soil, air, sunlight

Energy flow As plants and animals break down the bonds in food some of the energy held in the bonds gets released into the environment

Energy in an ecosystem can change forms and may move into or out of a particular ecosystem

KEY CONCEPT: Matter and energy cycle through the biotic and abiotic parts of the ecosystem. ***THIS MEANS THE TOTAL AMOUNT OF MATTER DOES NOT GO UP OR DOWN, IT JUST CHANGES TYPES***

The Carbon Cycle Process of carbon moving from the environment into organisms and back Importance: life on earth is carbon based meaning all living things are made of carbon

THE CARBON CYCLE

A trip through the carbon cycle A. Through photosynthesis, plants & algae add O 2 to the atmosphere and remove CO 2 (turned into glucose)

B. When animals eat plants & algae, the glucose in the plants becomes part of them

C. During respiration, organisms return CO 2 to the atmosphere (made when glucose breaks down) – Remember: Plants & algae make their own glucose, animals get glucose from the organisms they eat!

D. Decomposers: organisms that break down dead or decaying organisms – Note: Bacteria worms, insects & fungi also break down plant & animal waste

Decomposers release CO 2 into the atmosphere and other chemicals into the earth. Fossil fuels: natural fuels made from decomposed dead organisms in the earth – Examples: coal = dead plants buried & heated for millions of years

E. Combustion: burning living plants or fossil fuels for energy, releasing CO 2 into the atmosphere Examples: burning wood, coal, oil

F. Carbon atoms in the atmosphere/earth can become a part of plants or algae again, starting the cycle over