Synthesis of chemical compounds with the aid of radiant energy and especially light.

A branch of science concerned with the interrelationship of organisms and their environments.

A significant and long-lasting change in the Earth's climate and weather patterns.

A natural resource that is unlimited or that is naturally replenished rather quickly, such as sunlight or water.

The process whereby particles of liquids, gases, or solids and dissolved substances move from a region of higher to one of lower concentration

A rapid growth of microscopic algae or cyanobacteria in water, often resulting in a colored scum on the surface.

An isolated system which neither reactants nor products can enter or escape, yet which allows energy transfer (heat and light).

A measure used to rank solutions in terms of acidity or basicity (alkalinity).

A sealed transparent globe or similar container in which plants are grown.

A natural substance that is not replenished with the speed at which it is consumed.

The surroundings or conditions in which a person, animal, or plant lives or operates.

A biological community of interacting organisms and their physical environment.

Power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.

Process or system is able to continue by itself without anyone or anything else becoming involved.