Solution:

• First, as the oceans warm due to an increasing global temperature, seawater expands-taking up more space in the ocean basinand causing a rise in water level.
• The second mechanism is the melting of ice over land,which then adds water to the ocean.
• As the Earth warms, the melt line moves upwards so that the glacier melts faster and at the bottom, shortening the glacier and reducing its mass.
• Changes in the amount of sea ice can disrupt normal ocean circulation, thereby leading to changes in global climate.