The Center for Disease Control (CDC) has its own laboratories and national wastewater surveillance system to help local health departments with wastewater collection and testing. Why does the CDC have a wastewater surveillance system? - Wastewater can be treated to prevent viral spread in drinking water.

- Wastewater can be collected, tested, and used to trace viral outbreaks.

- Viral outbreaks are spread through wastewater treatment of drinking water.

- Wastewater can go through ozonation and chlorination to prevent virus spread.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

the correct answer is d

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

the answer is 100% density i've answered this question before and done the quiz myself.