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Air

Science - 3rd Grade EFL - Air and Photosynthesis
by

Justin M Thibedeau

on 12 December 2013

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Transcript of Air

Air
Science Unit 3
Photosynthesis in Forests
Leaves use sunlight to change CO2 and water (H2O) into sugar and oxygen. Plants are food for animals on land.
Forests and oceans take in CO2 and give out O2. People and animals breathe in O2 and breathe out CO2.
O
The Earth and Us
2
O
CO
2
H
2
O
CO
2
Can you live in a closed jar?
2
Why not?
= oxygen
= carbon dioxide
Where does our oxygen come from?
Forests
Oceans
Where does our carbon dioxide go?
O
2
Forests
Oceans
CO
2
Photosynthesis in Oceans
Phytoplankton are tiny plants. You can't see them with your eye. They use sunlight to change CO2 and water into oxygen. They are food for animals that live in water.
Chlorophyll
Plants and phytoplankton have chlorophyll. Chlorophyll is the special chemical that changes sunlight into food and oxygen. It also gives leaves and phytoplankton their green color.
Leaf
Chlorophyll
Phytoplankton
How?
Why?
But...
Why don't other living things make oxygen?
Candles in a Jar Experiment
If the fire burned all the air, then what is in the jar now?
Fire needs air.
Why did the
candles in
jars burn out?
Why?
Air is not one thing. There are different kinds of gas in the air. Fire burns one kind of gas in the air. When it burns, it makes a different kind of gas.
But...
So...
What is in our air?
78%
21%
.9%
.03%
.07%
Chlorophyll is the plant's blood.
Sunlight
CO2
O2
Food
Water
Full transcript