Cycling of Matter

27 questions on this block. Tap an answer and it moves on by itself — correct answers advance immediately, misses hold a few seconds so you can read why.

Matter cycles, energy flows Photosynthesis pulls carbon in; respiration and burning push it out. Bacteria and lightning make nitrogen usable. Phosphorus has no gas. Water evaporates, transpires, condenses and falls.

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Photosynthesis pulls carbon in; respiration, decomposition and burning fossil fuels push it out as carbon dioxide.

Part 1The carbon cycle

Part 2The nitrogen cycle

Part 3Water and phosphorus

Part 4Comparing cycles

Part 5Putting it together

Cycling of Matter

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