Rock weed and pond scum by Alice Haugen

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Slide Notes

Rock weed and pond scum

Published on Nov 19, 2015

No Description

PRESENTATION OUTLINE

Sometime, three billion years ago

Bluegreen algae began to grow

They covered the rocks

and learned to fix nitrogen

and filled the air with oxygen.

They even grew in hot springs.

They grew into stromatolites,

AND FED THE WORLD FOR A BILLION YEARS

And after Snowball Earth melted,

EARTH WAS READY FOR THE TRUE ALGAE

Alice Haugen

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