Which statement is not true about mass movements?
a. gravity is the driving force behind all mass movements.
b. mass movements always create landslides.
c. some mass movements are too slow to be seen.
d. mass movements are always downslope.

Is this a question of an answer

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.