Share VOCABULARY:Unit 2: Speaking Mind 4
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a very small piece of something
particle
a gas in the air; symbol O
Oxigen
the air aroung the Earth
atmosphere
plants with no roots or leaves that grow in water
algae
a large, thin, flat area of frozen water
ice sheet
an organism with only one cell
bacteria
a gas in the air. Symbol N
nitrogen
the northern or southern half of the Earth
hemisphere
a substance used in or produced by chemistry
chemical
a hard material that is formed by materials
rock
