NASA has selected 32 of the best Earth images from 2013 and is asking readers to help select one winner.
Each week, through April 4, voters can choose their favorite image in a tournament that pit two different photos against each other.
The photo that gets the most votes in the match-up moves onto the next round.
You can even download a bracket to fill out online.
Check out all the candidates here, then head over to the Earth Observatory's website to vote for your favorite photographs.
The is map estimates the average number of deaths per 1,000 square kilometers (386 square miles) per year due to air pollution. Dark brown areas have more premature deaths than light brown areas and blue areas have shown a decline in early deaths since 1850.
This map shows how much chlorophyll was in the ocean near the Aleutian Islands after a 2008 volcanic eruption, a natural fertilizer for the water. The levels rose above (green) or dipped below (brown) their normal levels due to an increase in phytoplankton — a plant-like microorganism that can soak up carbon dioxide from the air.
In this map of temperature anomalies, reds and blues show how much warmer or cooler each region of the globe was was in 2012 compared to an averaged base period between 1951 and 1980.
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