What is the medical specialty that studies the characteristics and uses of radioactive substances in diagnosis of disease? a. ultrasonography b. radiology c. radiation oncology d. nuclear medicine?

Radiology    are  the  medical specialty  that  study  the  characteristic  and  uses radioactive  substances  of  diseases.They  use  medical imagining  to  diagnose  and sometimes  also   treat  diseases  within  the  body. They  use  the  technique   such  as  x-ray ,  radiography , ultrasound,  computed  tomography  and  magnetic  resonance  imagining

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.