What Is the Most Important Reason Why an Icy Moon

Multiple Choice

What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?

A) Ice has a lower melting point than rock.
B) Ice is less rigid than rock.
C) Ice contains more radioactive elements than rock.
D) Ice is affected by tidal forces to a greater extent than rock.
E) Ice is less dense than rock.