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Crucigrama Sopa de Letras Hoja de Trabajo
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Natural Cycles

Horizontales
The brown smog produced when air pollutants react with sunlight.
The process in cells by which oxygen and glucose are used to produce energy and carbon dioxide.
A pollutant released into the atmosphere
A plant that hosts nitrogen-fixing bacteria in nodules on its roots.
The process that releases nitrogen from soil back into the atmosphere.
The process by which precipitation is gathered into a body of water.
Verticales
The precipitation that is more acidic than normal rainwater.
A swelling on a plant root that contains nitrogen-fixing bacteria
The cycling of chemical elements through the living and nonliving parts of an ecosystem
A source of energy formed from dead plants and animals.
The process that allows green plants to make sugars from sunlight, water, and carbon dioxide and that releases oxygen into the atmosphere
The conversion of nitrogen in the atmosphere to a form that can used by plants.
The precipitation that flows over the surface of the soil.