The city of Los Angeles released 96 million "shade balls" into the Los Angeles Reservoir. These will serve to shield the water from the sun's heat in order to reduce evaporation and prevent algal and bacterial growth so no toxic substances are produced in the water. The balls reduce evaporation by 85%-90% so will save a lot of water yearly.
The population is annually done every year on the 1st of January, it is counted by multiple surveys and research goes on for daily
The creation of the Salton sea was a result of an accidental diversion of the Colorado River.
Answer:
a) are the sources of long-period comets.