Educational worksheet on the biosphere, atmosphere, and hydrosphere with interactive questions and a lightbulb illustration.

Final Answer:
1. The biosphere is the part of Earth where life exists — it includes all living things and the environments they live in (like land, water, and air).
2. Lithosphere: rocks and soil (e.g., mountains); Hydrosphere: water (e.g., oceans); Atmosphere: air (e.g., oxygen we breathe).
3. The atmosphere is important because it gives us oxygen to breathe, protects us from harmful sun rays (via the ozone layer), helps regulate temperature, and provides weather systems that support ecosystems.
4. water that is underground or mixed into the geosphere

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