Stars seem to be made up of similar chemical elements. Which characteristics are used to c classify stars? A. size, age, and speed of revolution

B. brightness, speed of rotation, and color

C. weight, age, and temperature

D. brightness, temperature, size​

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere