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যে চক্রাকার পথে জীবদেহ গঠন উপযোগী রাসায়নিক মৌলসমূহ পরিবেশ থেকে জীবদেহে এবং জীবদেহ থেকে পরিবেশে আবর্তিত হয়, তখন তাকে জৈব ভূ-রাসায়নিক চক্র বলে।
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যে চক্রাকার পথে জীবদেহ গঠন উপযোগী রাসায়নিক মৌলসমূহ পরিবেশ থেকে জীবদেহে এবং জীবদেহ থেকে পরিবেশে আবর্তিত হয়, তখন তাকে জৈব ভূ-রাসায়নিক চক্র বলে।