Rock weed and pond scum by Alice Haugen

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Slide Notes

Rock weed and pond scum

Published on Nov 25, 2015

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PRESENTATION OUTLINE

Sometime, three billion years ago

Photo by yundaga

Bluegreen algae began to grow

and grow, and branch

Photo by Ricardo Rico

They covered the rocks

Photo by Jez22

and learned to fix nitrogen

Photo by Sea Moon

and filled the air with oxygen.

Photo by kenbobb

They even grew in hot springs.

Photo by Atlapix

They grew into stromatolites,

Photo by robertpaulyoung

and fed the world for

two billion years. Think of it!

Photo by Sprengben [why not get a friend]

And after Snowball Earth melted,

Photo by oceanking_uk_2003

Earth was ready for the

true algae. Hilarity ensued.

Photo by PROYECTO AGUA** /** WATER PROJECT

Alice Haugen

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