You will be shown 10 different circles of radius 250-2000 km. Using the slider (or manually typing into the box below the slider), guess the population contained within each circle then click SUBMIT for each one. Populations are based on world population density at https://human-settlement.emergency.copernicus.eu/index.php.

The object of this quiz is to place 20 circles of radius 1000 km on the map so that they contain the largest total population.

When you begin you'll be given a 1000-km radius circle centered on the map. Move it using the mouse and click SUBMIT. You will be given a score for that circle corresponding to the total population contained within it based on world population density at https://human-settlement.emergency.copernicus.eu/index.php. Try to complete all 20 circles with the highest total score.

Any INTERSECTING areas are only counted one time, so no population will be counted more than once.

The object of this quiz is to place 10 circles of radius 1000 km on the map so that they contain the largest total population.

When you begin you'll be given a 1000-km radius circle centered on the map. Move it using the mouse and click SUBMIT. You will be given a score for that circle corresponding to the total population contained within it based on world population density at https://human-settlement.emergency.copernicus.eu/index.php. Try to complete all 10 circles with the highest total score.

Any INTERSECTING areas are only counted one time, so no population will be counted more than once.