Proof+250 XP
Sketch How a Delta Forms
Draw a simple diagram of a river carrying sediment into the sea and building a delta. Post a photo.
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Nature · Facts & stats · iChallenge network
The Delta Challenge
Daily facts and stats about river deltas and the greek letter delta, plus real challenges to put them to work.
Today's 3 challenges
The Okavango Delta, which drains inland rather than into the sea, is in which country?
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Level1Rookie
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Streak0days
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Daily #33Resets at midnight UTC
Today's round
- 5 questions
- 20s each
- 0 played today
One ranked attempt per day. Practice as much as you like.
Challenges
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Streak · 7 days+185 XP
7-Day Water Watch
Each day, note one observation about a local stream, pond or rain runoff. Check in once a day.
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Streak · 7 days+185 XP
Greek Alphabet Streak
Learn three new Greek letters each day until you know them all. Check in once a day.
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By the numbers
Live counts from DeltaChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days126
Challenge joins3
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In the ArenaJoin your first challenge.
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Questions
How do I start?
Play today's quiz round, post your score, and start a streak.
What do I earn?
XP, levels, streaks and badges. Save your progress with an email and it follows you to every arena on the iChallenge network.
How does the daily round work?
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
How is my score calculated?
100 points per correct answer, up to 50 more for answering quickly, a combo multiplier for answers in a row, and 150 bonus points for a perfect round.
Is it free?
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.