Schematic cross section an specific mass balance (b) of a typical valley glacier and an ice sheet (top), showing the relation between equilibrium line and flow lines
<a href="//commons.wikimedia.org/wiki/User:Cactus26" title="User:Cactus26">Cactus26</a>
CC BY-SA 3.0
<p><span class="int-own-work" lang="en">Own work</span>, adapted from:
</p>
<ul><li>Roger LeB. Hooke: <i>Principles of Glacier Mechanics. Second Edition.</i> Cambridge University Press, Cambridge 2005, p. 18, <a href="//commons.wikimedia.org/wiki/Special:BookSources/0-521-83609-3" title="Special:BookSources/0-521-83609-3">ISBN 0-521-83609-3</a></li></ul>