Facts about snow and ice:

Snow covers upto 33% of the total land surface in winter. Most of this area is in the Northern Hemisphere. Virtually all of the snow melts in summer, excludint ice sheets, glaciers, sea ice and permanent snow fields. Snow influences the surface albedo, thereby altering climate. However, this is limited to some extent because the wintertime solar flux is rather low and snow doesn't last long into spring and summer.

Mountain glaciers develop from snow that accumulates and consolidats to become ice. Glaciers necessarily flow. Glaciers are good integrators of climate because they are composed of ice that can be many centuries and thousands of years old. They have very little influence on large-scale climate.

Ice sheets are small everywhere (as far as their influence on climate) but on Greenland and Antarctica. These ice sheets, however, are so massive and long lived that they are not necessarily in equilibrium with the climate during even say an average over a century. Greenland ice covers 1.7 million square km and reaches about 3.7km high. The outer edge reaches the melting temperature in summer but the summit rarely, if ever, melts. Mass loss is by calving and melting. Antarctica ice covers 13.7 million square km and reaches about 2km high on the west side (the West Antactic Ice Sheet) and about 4km on the east side (guess its name). Temperatures above freezing are rare. Mass loss is by calving. The mass of Antarctica may be increasing if it is accumulating ice faster than the loss by calving. The area of the big ice sheets does not fluctuate very much in modern times and so their influence on the surface albedo is fairly steady. They are mostly relevant for modern and future climate for their on sea level rise. They are also wonderful recorders of climate and played an interesting role in climates of the past. 

We like to compare the amount of sea level rise these mounds of ice could contribute if they melted:
Greenland 7 m,
Antarctica 73 m (your book says 60m, so this may be disputed, but its big anyway)
Mountain glaciers and small ice sheets etc 0.45 m

Sea ice and icebergs don't contribute anything to sea level rise because they are already embedded in sea water (recall Archimedes principle).

The seasonal distribution of sea ice in the Northern Hemisphere ranges from 8.5 to 10.5 million square km and the thickness of the ice that survives the summer season is about 3m thick on average. The ice that exists only in winter is about 1m thick on average. Sea ice around Antarctica
has a larger seasonal range from 4 to 20  million square km. Little of it survives the summer so its thickness is about 1 m thick on average everywhere. These thicknesses estimates are very crude, but thickness isn't well measured either. Sea ice is special as far as climate is concerned, although the areal coverage is far less than for snow on land, it has a very strong influence on climate. In part because it lasts through summer in the Nothern Hemisphere but also because of the following feedback loop: