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 "reply": "<a2ui>\nroot = body_content = [\n  article_hero(\n    \"The Water Cycle\",\n    \"Understanding Earth's most essential process\",\n    \"https://images.unsplash.com/photo-1446776653964-20c1d3a81b06?w=1200\"\n  ),\n  concept_ladder(\n    title=\"The Water Cycle\",\n    eyebrow=\"EARTH SYSTEMS\",\n    dek=\"The continuous movement of water across our planet\",\n    hook=\"Water is constantly on the move. From the oceans to the atmosphere and back again, the water cycle powers weather, climate, and all life on Earth.\",\n    model=\"Think of it as a `planetary recycling system` \u2014 water changes form and location, but never leaves the Earth.\",\n    model_note=\"The same water molecules have cycled for billions of years.\",\n    rungs=[\n      concept_rung(\n        badge=\"1\",\n        kind=\"depth\",\n        title=\"Evaporation\",\n        body=\"Solar energy heats water in oceans, lakes, and rivers, transforming it from liquid to invisible water vapor. This vapor rises into the atmosphere.\\n\\nEvaporation is the primary driver that sets the entire cycle in motion. About 86% of global evaporation comes from ocean surfaces.\"\n      ),\n      concept_rung(\n        badge=\"2\",\n        kind=\"depth\",\n        title=\"Condensation\",\n        body=\"As water vapor rises and cools in the upper atmosphere, it transforms back into liquid water droplets. These droplets cluster together to form clouds.\\n\\nThis process releases latent heat, which influences weather patterns and atmospheric circulation.\"\n      ),\n      concept_rung(\n        badge=\"3\",\n        kind=\"depth\",\n        title=\"Precipitation\",\n        body=\"When cloud droplets combine and become heavy enough, they fall back to Earth as rain, snow, sleet, or hail. Precipitation returns water to the land and oceans.\\n\\nOn average, Earth receives about 505,000 cubic kilometers of precipitation annually.\"\n      ),\n      concept_rung(\n        badge=\"4\",\n        kind=\"depth\",\n        title=\"Collection & Infiltration\",\n        body=\"Precipitation collects in oceans, rivers, lakes, and underground aquifers. Some water infiltrates soil, recharging groundwater reserves. The cycle then begins anew as this water eventually evaporates or flows back to the ocean.\"\n      ),\n      concept_rung(\n        badge=\"EX\",\n        kind=\"example\",\n        title=\"Worked Example: A Water Droplet's Journey\",\n        body=\"Let's follow one water molecule through a complete cycle:\",\n        code=\"Day 1:   Water droplet evaporates from Pacific Ocean\\nDay 3:   Rises 3 km; cools and condenses into cloud\\nDay 5:   Falls as rain over California coast\\nDay 20:  Infiltrates soil; absorbed by tree roots\\nDay 60:  Transpires through tree leaves back to atmosphere\\nDay 90:  Cycles again as atmospheric vapor\",\n        takeaway=\"One water molecule can complete this journey in days or take centuries if stored in ice or groundwater.\"\n      )\n    ],\n    closing_note=\"The water cycle connects every ecosystem on Earth \u2014 understanding it is key to grasping climate, weather, and environmental science.\",\n    theme=\"light\"\n  ),\n  heading(\"Check Your Understanding\"),\n  quiz_set(\n    title=\"Water Cycle Self-Check\",\n    pass_score=70,\n    accent=\"#4f46e5\",\n    questions=[\n      {\n        question=\"Which process describes water transforming from liquid to vapor?\",\n        options=[\"Condensation\", \"Evaporation\", \"Precipitation\", \"Infiltration\"],\n        correct=1,\n        explanation=\"Evaporation is when solar energy heats water and converts it into invisible water vapor that rises into the atmosphere.\"\n      },\n      {\n        question=\"What happens when water vapor cools in the upper atmosphere?\",\n        options=[\"It falls as rain\", \"It condenses into cloud droplets\", \"It returns to the ocean\", \"It freezes solid\"],\n        correct=1,\n        explanation=\"Condensation occurs when rising water vapor cools and transforms back into liquid water droplets, forming visible clouds.\"\n      },\n      {\n        question=\"Which of these is NOT a form of precipitation?\",\n        options=[\"Rain\", \"Evaporation\", \"Snow\", \"Hail\"],\n        correct=1,\n        explanation=\"Evaporation is the process that removes water from surfaces \u2014 it is not a form of precipitation (water falling to Earth).\"\n      }\n    ],\n    on_pass=info_card(\n      title=\"Excellent Work!\",\n      text=\"You understand the key stages of the water cycle. Keep exploring how this cycle influences weather and climate in your region.\"\n    ),\n    on_fail=info_card(\n      title=\"Keep Learning\",\n      text=\"Review the concept sections above and try the quiz again. Pay special attention to the differences between each stage of the cycle.\"\n    )\n  )\n]\n</a2ui>"
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