There are many different logos for Earth Day. You can do a Google image search for them.
Mother's Day doesn't have an official "logo" although there are lots of clipart images that have been made to represent Mother's Day. If you need it for a project of some kind, one of those should do.
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If you are referring to the band, you can download the official logo from their website. The logo is also displayed on their Facebook pageswhere you could save the logo from the image there.
I left two links at the bottom.
Earth Day in 2011 falls on Friday, April 22, 2011.
The official logo points to the right.
The Federal Bureau of Investigation's logo can be found at their official website. There are also frequent photos and updates released that include the logo.
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The Olympic games do not have an official mascot. The logo of the Olympics is five interconnected rings. Each ring represents an inhabited continent on earth.
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