I weave through the earth, unseen and pure; I support the green, yet I am not life. What am I?
Category: Geography · Difficulty: expert
Hint: Consider vital lifelines hidden beneath the ground.
Answer
An underground river system
Explanation
An underground river system sustains ecosystems while remaining out of sight.
This is a expert geography riddle — one of the harder riddles here. The answer is An underground river system.
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