Examlex
Which of the following is the largest river in East Asia?
Natural Source
An origin of materials or energy that is found in nature and not artificially created, such as sunlight, plants, minerals, or water.
Environmental Protection Agency
A U.S. federal agency responsible for the regulation and enforcement of laws aimed at protecting human health and the environment.
Elevated Radon Levels
Refers to higher concentrations of radon gas in the atmosphere or in buildings, which is hazardous to health due to its radioactive properties.
Radioactive Isotopes
Atoms of the same element that have different numbers of neutrons and exhibit radioactivity by emitting radiation.
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