Help me ASAP PLZZ!! If the half life of a decaying isotope is 10 years which statement is true after 10 years? The link has a screen shot of the question and answers.

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.