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2 results for “energy”.

• Why There Are So Few Top Predators — The 10% Rule of Energy
  A forest can feed ten thousand deer, a thousand wolves at most, and one bear family per valley. The reason is not hunting skill or territory — it is thermodynamics, and the same arithmetic that limits your food chain also explains why eating lower on it feeds more people.
• How the Water Cycle Works: Evaporation, Condensation and Precipitation
  Earth has a fixed supply of water that has been recycled for billions of years. The water cycle is how solar energy moves that water between oceans, air and land — and why the glass you drink from has probably passed through a cloud, a river and an ocean more times than you can count.