Editing Moraine (section)

===Lateral moraines===
[[File:MorainesLakeLouise.JPG|thumb|Lateral moraines above [[Lake Louise (Alberta)|Lake Louise]], Alberta, Canada.]]

Lateral moraines are parallel ridges of debris deposited along the sides of a glacier. The unconsolidated debris can be deposited on top of the glacier by [[frost shattering]] of the valley walls or from tributary streams flowing into the valley,<ref>{{Cite web|date=May 5, 2011|title=Lateral Moraine|url=https://www.nationalgeographic.org/encyclopedia/moraine/|access-date=June 18, 2020|website=National Geographic Encyclopedia}}</ref> or may be subglacial debris carried to the surface of the glacier, melted out, and transported to the glacier margin.<ref name=LukasEtal2012>{{cite journal |last1=Lukas |first1=Sven |last2=Graf |first2=Andreas |last3=Coray |first3=Sandro |last4=Schlüchter |first4=Christian |title=Genesis, stability and preservation potential of large lateral moraines of Alpine valley glaciers – towards a unifying theory based on Findelengletscher, Switzerland |journal=Quaternary Science Reviews |date=March 2012 |volume=38 |pages=27–48 |doi=10.1016/j.quascirev.2012.01.022|bibcode=2012QSRv...38...27L }}</ref>

[[File:Glacier.zermatt.arp.750pix.jpg|left|thumb|Moraines clearly seen on a side glacier of the [[Gorner Glacier]], Zermatt, Switzerland. The '''lateral moraine''' is the high snow-free bank of debris in the top left hand quarter of the picture. The '''medial moraine''' is the double line of debris running down the centre-line of the glacier.]]

Lateral moraines can rise up to {{convert|140|m||sp=us}} over the valley floor, can be up to {{convert|3|km||sp=us}} long, and are steeper close to the glacier margin (up to 80 degrees) than further away (where slopes are typically 29 to 36 degrees).<ref name=LukasEtal2012/>