1. Unit 4: Ecology Lesson 2: Carbon Cycle
Science 9
Unit 4: Ecology
Lesson 2: Carbon Cycle

2. Objectives By the end of the lesson you should be able to:
Describe how carbon is cycled through an ecosystem
Draw a simplified carbon cycle
Explain how the carbon cycle is related to your planet issue

3. Carbon Cycle Stored in sinks in gigatonnes
Gigatonnes: billion tons of nutrient
16 gigatonnes = tons

4. Carbon Cycle Sinks: places where nutrients accumulate
Nutrients flow into and out of sinks
Major sinks: atmosphere
oceans
land
sediments

5. General Nutrient Cycle Overview
Add in the details to your general nutrient cycle
NATURAL HUMAN
Atmosphere
Land clearing
Agriculture
Urban expansion
Mining
Industry
Motorized transport
Land
producers
Oceans
consumers
consumers
producers
decomposers
decomposers
Sediments

6. Carbon Cycle Choose 4 colours and the legend on your notes Sinks □
Natural pathways □
Human pathways □
Extra labels (any extra info) □

7. Change in land use (agriculture) Atmosphere as CO2 (750) (1.5)
Fossil Fuel Combustion (5.5)
Photosynthesis (120)
(0.5)
Plant Respiration (60)
Sea Surface Gas Exchange
Vegetation
Animals
Oceans
(3)
(3000)
( )
Decomposition
(60)
Marine Life
Coal Deposits
Dissolved Organic Carbon
(700)
(40)
(50)
(1600)
(100)
(300)
(90)
Soil and Organic Matter
Oil and Gas Deposits
To deep stores (very slow, takes millions of years)
( – )
Intermediate and deep water
From deep stores (very rapid takes tens or hundreds of years)
Marine sediment and sedimentary rock
( – )