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World

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World Circle Radius Population Challenge

Directions

The object of this quiz is to adjust each circle’s radius so it contains the target population shown at the right. When you click Start you will be shown a marker on a random populated world grid square (there are over 800K 10×10 km grid squares used for the data, courtesy of https://human-settlement.emergency.copernicus.eu/index.php). Also you will see an adjustable circle of radius 500 km to start. Adjust the circle’s radius by dragging it until it contains the target number of people shown – this target will be between 2.5 and 250 million people. Then click submit. You are scored on how close your circle’s population is to the target.

Enter guesses above to begin.

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The object of this quiz is to fill in each blank flag with the correct colors for that country. When you click START you will be shown a country and 12 colors on the right, these include the flag's color and random colors not in that flag. Click on colors that represent at least 5% of that country's flag. If you click a correct flag color it will fill in on the flag and that color box will get a green border. An incorrect color will show with a red border. Complete all the colors in the flag to move on to the next country. Completing 10 countries will end the quiz.

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World 50K+ City Latitude Grid Blackout

Type 'easy' or 'hard' to begin the quiz. Easy is a 5-degree range, hard is a 2.5-degree range. Then, name any 50K+ World city in each latitude range which fits the category label for each square.

LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 250-500K) means the city has that range for its population.
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At the end of the quiz the largest population missed answer will show in each range.

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Type 'easy' or 'hard' to begin the quiz. Easy is a 10-degree range, hard is a 5-degree range. Then, name any 50K+ World city in each longitude range which fits the category label for each square.

LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 250-500K) means the city has that range for its population.
2+ WORDS means the city name has 2 or more words (words denoted by a space or hyphen).

At the end of the quiz the largest population missed answer will show in each range.

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mlnbld

27 minutes ago

Really fun quiz idea!