Electricity produced by moving water, especially from across a river.
hydroelectric power
The basic unit of a chemical element.
The surroundings or conditions in which a person, animal, or plant lives or operates.
The action of dividing or splitting something into two or more parts.
The process or result of joining two or more things together to form a single entity.
A gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.
global warming
The time taken for the radioactivity of a specified isotope to fall to half its original value.
The energy released during nuclear fission or fusion, especially when used to generate electricity.
nuclear energy
The ability to do something or act in a particular way, especially as a faculty or quality.
The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
A fuel derived directly from living matter.
Materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
natural resources
An organic natural resource which can replenish to overcome usage and consumption, either through biological reproduction or other naturally reoccurring processes.
renewable resource
Radiant energy emitted by the sun.
solar energy
The cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.
water cycle
The conversion of one form of energy into another, or the movement of energy from one place to another.
energy transfer
An energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.
radiant energy
The perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction.
A hot spring in which water intermittently boils, sending a tall column of water and steam into the air.
The quality of being hot; high temperature.
The vapor into which water is converted when heated, forming a white mist of minute water droplets in the air.
Of, relating to, or produced by the internal heat of the earth.

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