A fresh stool sample is cultured to identify the cause of diarrhea and disease carriers. Most common pathogens, such as Salmonella species, Shigella, and E coli 0.157, can be grown on standard media. Yersinia and Campylobacter require a special culture medium.
And while scientists have never sent a probe to our planetâs core to obtain accurate measurements, various estimates have been made. For instance, it is believed that the temperature of the Earthâs inner core is as high as 7000 Â°C, whereas the outer core is thought to be between 4000 and 6000 Â°C. Meanwhile, the mantle, the region that lies just below the Earthâs outer crust, is estimated to be around 870 Â°C.
The core is an iron-rich sphere with a radius of 3486 kilometers (2161 miles). It has a density of nearly 11g/cm3 (the crust and mantle have densitys of 2.7-3) and at its center the density approaches 14g/cm3. Earth's interior is characterized by gradual increases in temperature, pressure, and density.