Science 10 Lesson 5 Carbon Nitrogen and Phosphorus
Science 10 Lesson 5: Carbon, Nitrogen and Phosphorus Cycles
Objectives By the end of the lesson you should be able to: o Describe how carbon is cycled through an ecosystem o Describe how nitrogen is cycled through an ecosystem o Describe how phosphorus is cycled in an ecosystem
Nutrient Cycles o Megatonnes: million tons of nutrient stored n o 26 megatonnes = 26 000 tons Gigatonnes: billion tons of nutrient n 16 gigatonnes = 16 000 000 tons
Nutrient Cycle o We will look at C, N and P o Stores: places where nutrients accumulate n n Nutrients flow into and out of stores Major stores: atmosphere oceans land sediments
Nutrient Cycle Overview NATURAL HUMAN Atmosphere Land clearing Land Agriculture producers Oceans consumers producers decomposers Sediments consumers Urban expansion Mining Industry Motorized transport
Carbon Cycle: pg. 76 o Choose 4 colours n n Stores Natural pathways Human pathways Extra labels
Nitrogen Cycle: pg. 81 o Choose 6 colours: n n n Stores Nitrogen fixing (Natural pathway!) Nitrification (Natural pathway!) Denitrification (Natural pathway!) Human pathways Extra labels
Phosphorus Cycle: pg. 85 o Choose 4 colours: n n Stores Natural pathways Human pathways Extra labels
Cut and Paste! o With a partner cut out the Carbon words (on yellow) and try to arrange them into the carbon cycle WITHOUT using your notes or databook! n n o Try it now with the Nitrogen words (on pink) And finally with Phosphorus words (on blue) After you have tried your best – use your databook for help!
Your Turn! o All your words should be cut out – now paste them down and add in any arrows and/or extra information needed for your cycle to make sense! 3 way Venn Diagram and practice questions: Pg 75 #1 -4; Pg 78 #1 -4; Pg 83 #1 -4; Pg 86 #1 -4; Pg 91 #1 -19 o
- Slides: 10