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risk the possibility if a loss or injury R strategist species insect species with characteristics that make them more likely than others to become ag. pests; lots of babies; mature faster radioactive waste useless radioactive materials that are left after some laboratory or commercial process is completed radiation energy that is radiated or transmitted in the form of rays or waves or particles radioisotope An isotope that has an unstable nucleus and undergoes radioactive decay rainforest an area of lush vegetation and year-round rainfall rainshadow a dry area on the mountainside facing away from the wind radon a gas that arises from the earth where radioactive materials are present rangelands Grasslands and open woodlands suitable for livestock grazing RCRA (resource conservation recovery act) Enacted in 1976 to give EPA "Cradle to Grave" authority on hazardous waste. red tide an algal bloom that occurs in salt water recycling the act of processing used or abandoned materials for use in creating new products remediation Cleaning up chemical contaminants from a polluted area renewable resource any natural resource (as wood or solar energy) that can be replenished naturally with the passage of time reproduction the production of offspring restoration research devoted to restoring, comparing, and reconstructing damaged ecosystems riparian of or relating to or located on the banks of a river or stream rivers and streams moving waters, generally well mixed, current can strongly influence communities roosevelt US president concerned with conservation and creation of national parks run off Water (usually from rain) that flows over a land surface in streams and water ways