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 "reply": "<a2ui>\nroot = content_tabs(\n  tabs=[\n    {\n      label: \"Overview\",\n      blocks: [\n        gradient_heading(\n          text: \"The Water Cycle\",\n          gradient: \"linear-gradient(135deg, #3b82f6, #06b6d4)\",\n          size: \"clamp(2rem, 5vw, 3.5rem)\"\n        ),\n        annotation_highlight(\n          text: \"The water cycle, also called the hydrologic cycle, describes the continuous movement of water on Earth. Water evaporates from surfaces, condenses in the atmosphere, precipitates back to Earth, and infiltrates the ground in an endless process.\",\n          notes: [\n            {term: \"evaporates\", explanation: \"Water transforms from liquid to gas, rising into the atmosphere\", color: \"#fbbf24\"},\n            {term: \"condenses\", explanation: \"Water vapor cools and becomes liquid droplets, forming clouds\", color: \"#60a5fa\"},\n            {term: \"precipitates\", explanation: \"Water falls to Earth as rain, snow, sleet, or hail\", color: \"#34d399\"},\n            {term: \"infiltrates\", explanation: \"Water soaks into soil and groundwater, completing the cycle\", color: \"#a78bfa\"}\n          ]\n        ),\n        spacer(height: 32)\n      ]\n    },\n    {\n      label: \"Key Concepts\",\n      blocks: [\n        feature_grid(\n          heading: \"Four Main Stages\",\n          columns: 2,\n          features: [\n            {\n              icon: \"\u2600\ufe0f\",\n              title: \"Evaporation\",\n              description: \"Solar energy heats water in oceans, lakes, and rivers, turning it into invisible water vapor that rises into the atmosphere.\",\n              badge: \"Heat-driven\"\n            },\n            {\n              icon: \"\u2601\ufe0f\",\n              title: \"Condensation\",\n              description: \"Water vapor cools in the upper atmosphere and transforms into tiny liquid droplets, forming visible clouds and fog.\",\n              badge: \"Cooling process\"\n            },\n            {\n              icon: \"\ud83c\udf27\ufe0f\",\n              title: \"Precipitation\",\n              description: \"Water droplets combine and become heavy enough to fall as rain, snow, sleet, or hail back to Earth's surface.\",\n              badge: \"Return to surface\"\n            },\n            {\n              icon: \"\ud83d\udca7\",\n              title: \"Collection & Infiltration\",\n              description: \"Precipitation collects in bodies of water and soaks into soil as groundwater, preparing to evaporate again.\",\n              badge: \"Cycle completes\"\n            }\n          ]\n        ),\n        spacer(height: 24),\n        bento_grid(\n          heading: \"Related Processes\",\n          columns: 3,\n          tiles: [\n            {\n              title: \"Transpiration\",\n              subtitle: \"Plants release water vapor through leaves\",\n              icon: \"\ud83c\udf3f\",\n              span: 1,\n              color: \"#86efac\"\n            },\n            {\n              title: \"Sublimation\",\n              subtitle: \"Ice converts directly to water vapor\",\n              icon: \"\u2744\ufe0f\",\n              span: 1,\n              color: \"#7dd3fc\"\n            },\n            {\n              title: \"Runoff\",\n              subtitle: \"Water flows over land to rivers and oceans\",\n              icon: \"\ud83c\udfde\ufe0f\",\n              span: 1,\n              color: \"#fcd34d\"\n            }\n          ]\n        )\n      ]\n    },\n    {\n      label: \"Worked Example\",\n      blocks: [\n        case_study_card(\n          title: \"Tracking a Water Droplet's Journey\",\n          situation: \"A raindrop falls into the Pacific Ocean near Hawaii. We will trace its path through the complete water cycle over several weeks.\",\n          data_points: [\n            {label: \"Starting location\", value: \"Pacific Ocean\", note: \"Surface water, 25\u00b0C\"},\n            {label: \"Distance to atmosphere\", value: \"~10 km\", note: \"Average cloud height\"},\n            {label: \"Time to evaporate\", value: \"10-14 days\", note: \"Under tropical sun\"},\n            {label: \"Cloud formation time\", value: \"2-3 days\", note: \"After condensation\"}\n          ],\n          questions: [\n            \"What provides the energy for our droplet to evaporate?\",\n            \"Why might our droplet condense into a cloud over the ocean?\",\n            \"If the droplet precipitates over land instead of returning to ocean, what would happen next?\"\n          ],\n          model_answer: \"Day 1-14: The droplet absorbs solar heat and evaporates into water vapor, rising with warm air currents. Day 15-17: As it rises, the air cools, and the water vapor condenses around dust particles to form a cumulus cloud. Day 18: Cooler air causes the droplets to merge and grow heavy. Day 19: Precipitation occurs as rainfall over the Hawaiian Islands. Day 20-21: The droplet infiltrates volcanic soil, becoming groundwater. Day 22+: It will eventually emerge in a spring or be taken up by plant roots, beginning the cycle anew.\"\n        )\n      ]\n    },\n    {\n      label: \"Self-Check Quiz\",\n      blocks: [\n        gradient_heading(\n          text: \"Check Your Understanding\",\n          size: \"2rem\",\n          weight: 700\n        ),\n        spacer(height: 16),\n        choicebox_group(\n          label: \"Question 1: What is the primary energy source for the water cycle?\",\n          name: \"q1\",\n          items: [\n            {\n              value: \"a\",\n              title: \"Solar Energy\",\n              description: \"The sun heats water bodies, causing evaporation\",\n              icon: \"\u2600\ufe0f\"\n            },\n            {\n              value: \"b\",\n              title: \"Earth's Internal Heat\",\n              description: \"Geothermal energy drives the cycle\",\n              icon: \"\ud83d\udd25\"\n            },\n            {\n              value: \"c\",\n              title: \"Wind Currents\",\n              description: \"Moving air creates water cycle\",\n              icon: \"\ud83d\udca8\"\n            },\n            {\n              value: \"d\",\n              title: \"Atmospheric Pressure\",\n              description: \"Pressure changes drive evaporation\",\n              icon: \"\ud83d\udcca\"\n            }\n          ]\n        ),\n        spacer(height: 20),\n        choicebox_group(\n          label: \"Question 2: Which process transforms water vapor back into liquid droplets?\",\n          name: \"q2\",\n          items: [\n            {\n              value: \"a\",\n              title: \"Evaporation\",\n              description: \"Liquid water becomes vapor\",\n              icon: \"\u2600\ufe0f\"\n            },\n            {\n              value: \"b\",\n              title: \"Condensation\",\n              description: \"Water vapor cools and becomes liquid\",\n              icon: \"\u2601\ufe0f\"\n            },\n            {\n              value: \"c\",\n              title: \"Precipitation\",\n              description: \"Water falls as rain or snow\",\n              icon: \"\ud83c\udf27\ufe0f\"\n            },\n            {\n              value: \"d\",\n              title: \"Infiltration\",\n              description: \"Water soaks into soil\",\n              icon: \"\ud83d\udca7\"\n            }\n          ]\n        ),\n        spacer(height: 20),\n        choicebox_group(\n          label: \"Question 3: What is one way that water can return to the ocean from land?\",\n          name: \"q3\",\n          items: [\n            {\n              value: \"a\",\n              title: \"Runoff\",\n              description: \"Water flows downhill through rivers and streams\",\n              icon: \"\ud83c\udfde\ufe0f\"\n            },\n            {\n              value: \"b\",\n              title: \"Transpiration\",\n              description: \"Plants release water from their leaves\",\n              icon: \"\ud83c\udf3f\"\n            },\n            {\n              value: \"c\",\n              title: \"Sublimation\",\n              description: \"Ice converts directly to vapor\",\n              icon: \"\u2744\ufe0f\"\n            },\n            {\n              value: \"d\",\n              title: \"Condensation\",\n              description: \"Water vapor becomes droplets\",\n              icon: \"\u2601\ufe0f\"\n            }\n          ]\n        ),\n        spacer(height: 24),\n        learning_objectives(\n          objectives: [\n            \"I can identify the four main stages of the water cycle\",\n            \"I can explain the role of solar energy in powering the water cycle\",\n            \"I can trace the path of a water molecule through evaporation, condensation, precipitation, and collection\",\n            \"I understand how transpiration and sublimation affect the water cycle\",\n            \"I can apply knowledge of the water cycle to real-world scenarios\"\n          ]\n        )\n      ]\n    }\n  ]\n)\n</a2ui>"
}