Carbon Cycle 1. What is the difference between a renewable and non-renewable resource? 2. Describe how fossil fuels are formed over time 3. Are fossil fuels renewable or non-renewable? Explain your reasoning. 4. What is one disadvantage of using fossil fuels as our primary source of energy? Write in complete sentences! Don’t talk during the Catalyst!

4.3 Objectives By the end of today, all SWBAT…  Identify the forms and sources of carbon  Describe the 6 steps of the carbon cycle, and how humans affect it

4.3 Agenda  Money analogy  Carbon forms and sources  Steps of the carbon cycle  GP  Musical chairs  How humans impact the carbon cycle  Classwork  Exit question

Money and Carbon Is money found in only one form? Where are all the possible places that a $1 bill could go in a period of 10 years? Do you really ever destroy money? When do you make money? Money = _____________________________________ Bank = _______________________________________ Money and Carbon Is money found in only one form? Where are all the possible places that a $1 bill could go in a period of 10 years? Do you really ever destroy money? When do you make money? Money = _____________________________________ Bank = _______________________________________

Money analogy: Money is found in many different forms – Checks, credit cards, dollars, change Money moves from the bank to you to other people Money will continue cycling in the system forever Carbon is exactly like money: changes forms and where it is

Key Point #1: Carbon is found in different forms and different sources A. Forms of carbon – CO 2 – Organic B. Sources of carbon – Plants – Animals – Soil – Atmosphere – Fossil fuels – Dead things

Key Point #2: Carbon moves from source to source in five different processes (steps)

 Photosynthesis  Respiration  Decomposition  Combustion (fossil fuel burning)  Gas exchange Five steps of the carbon cycle

 CO2 in atmosphere: money in the bank  CO2 out of atmosphere: take money out  CO2 in atmosphere: money in bank

Section 2.2 Summary – pages Carbon Cycle A

A  Process: Cellular respiration  Illustration Description: Arrow points from plants to atmosphere  Definition: plants and animals break down organic carbon to CO 2  Money Analogy: returning money (CO 2 ) to the bank

Respiration CO 2

Section 2.2 Summary – pages Carbon Cycle B

B  Process: Photosynthesis  Illustration Description: Arrow points from atmosphere to plants  Definition: plants convert CO 2 into glucose (sugar)  Money Analogy: taking money out of the bank as dollars

Photosynthesis + CO 2

Section 2.2 Summary – pages Carbon Cycle C

C  Process: Combustion  Illustration Description: from factory to atmosphere  Definition: burning fossil fuels releases CO 2  Money Analogy: returning money (CO 2 ) to the bank

Combustion CO 2 !!!!

Section 2.2 Summary – pages Carbon Cycle D D

D  Process: Gas exchange  Illustration Description: arrows between water and atmosphere  Definition: CO 2 dissolves in and out of water  Money Analogy: money in and out of bank

Gas exchange Water CO 2

Section 2.2 Summary – pages Carbon Cycle E

E  Process: Decomposition  Illustration Description: dead animals to underground  Definition: carbon stored as fossil fuels after things die  Money Analogy: money hidden under the bed

Decomposition C C C C C C C

What step of the carbon cycle???  Involves plants removing CO 2 from the atmosphere?  Involves plants and animals releasing CO 2 into the atmosphere?  Involves a human activity releasing CO 2 into the atmosphere?  Adds and releases CO 2 into the atmosphere at the same time?

Musical Chairs

Take the carbon cycle a step farther…  Answer questions on your classwork  Work together  Think hard  Answer thoughtfully

Key Point #3: Humans are dramatically increasing CO 2 levels in two ways

Pre-reading Questions 1. Answer pre-reading questions BEFORE reading 2. Read paragraph and  circle key words  Underline key facts 3. Answer post-reading questions

Start the Homework

Exit Questions Write in complete sentences! Don’t talk during the Exit Question!