main components with simple machines
click here
https://drive.google.com/open?id=0B6CyOEmon-ksanU0XzEwUmpkVVhhOVJDOUVRWkN4cTJZbXo4
https://drive.google.com/open?id=0B6CyOEmon-ksanU0XzEwUmpkVVhhOVJDOUVRWkN4cTJZbXo4
christmas
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¿Are we greener now?
I think we are greener now than before, because now we are more interested because we produce a lot of pollution
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