This melting action accounts for the great speeds obtainable by an ice boat which are easily several times the speed of the wind depending on the boat and ice conditions .
(an ice boat; are easily; several times) (the wind; depending; on the boat and ice conditions) (This melting action; accounts; for the great speeds obtainable by an ice boat)
an ice boat the wind This melting action
are easily depending accounts
several times
on the boat and ice conditions
for the great speeds obtainable by an ice boat