Adjoining areas of well formed ice are often pushed against each other by wind and tide creating pressure ridges. In the lower close up photo blue streaks of more highly compressed ice can be seen. 

more Ice . . .  |  Antarctica Home Page
 

Living Travel Front Page
Africa  ||  Antarctica  ||  Arctic  ||  Asia  ||  Europe  ||  UK
Indian Ocean  ||  Middle East  ||  North America  ||  Pacific  ||  South America