today is my science exam, guys I need your help, please tell me key words
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Answer:
1. drought is a period of time when an area or region experiences below-normal precipitation. The lack of adequate precipitation, either rain or snow, can cause reduced soil moisture or groundwater, diminished stream flow, crop damage, and a general water shortage.
2. careful preservation and protection of something especially : planned management of a natural resource to prevent exploitation, destruction, or neglect water conservation wildlife conservation.
3. Objects that can emit light energy by themselves are known as luminous objects. ... The luminous objects are visible as they emit light on their own.
4. Waste is any substance which is discarded after primary use, or is worthless, defective and of no use. A by-product by contrast is a joint product of relatively minor economic value.