Photosynthesis, The process by which green plants make their own food using sunlight, water, and carbon dioxide., Equator, A line that divides the Earth into the Northern and Southern Hemispheres., Archipelago, A group or chain of islands., Democracy, A system of government in which people choose their leaders by voting., Volcano, A mountain that releases molten rock, ash, and gases from inside the Earth., Oxygen, A gas that humans and animals need to breathe., Renewable Energy, Energy that can be naturally replaced, such as from the sun or wind., Global Warming, The gradual increase in the Earth’s temperature caused by pollution and greenhouse gases., Internet, A global system that connects millions of computers and allows sharing of information., Gravity, The natural force that pulls objects toward the center of the Earth..

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