during the winter months, water on the surface of a pond will typically freeze and this ice acts as an insulator for the water
beneath it. as a result, aquatic life is able to survive during the cold winter. the reason that this water expands upon freezing is
due to

Explanation:

Due to the crystalline arrangement of water molecules when it freezes, upon freezing the positive charge over hydrogen atoms in water attracts the water molecules and as the water starts freezing this attraction force form a crystal net in water with gaps in it. This crystal net structure take lot of space and hence water expands as it turns into ice.

the  different  of  these  two  are  that  they  differently  handle  their  team.

an  expressive  leader  focuses  on  the  task  at  hand  and  make  sures  that  their  goal  is  achieved.  they  accurately  finish  the  task.  an  instrumental  leader  on  the  other  hand  works  on  the  unity  of  the  group,  they  care  more  about  their  employees.  all  the  while  creating  a  good  environment.