The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called . atomic mass
mass number
critical mass

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

What can be found in the ionosphere

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces