from the bare ground. Land sky is not as dark as water sky. See 



sky map. Cf . blink. 

 LANE: (I.C.Lb.)— Lead. 

 LARD ICE: (I.A.3.a.)— Grease ice. 

 LATERAL MORAINE: (II.B.) — Ridge of debris near the margin and 



parallel to the axis of a glacier. (Frontispiece, Figs. 71, 74.) 

 LEAD: (I.C.l.b.) — A long, narrow, but navigable water passage in pack 



ice. A lead may be covered by thin ice. See water opening. (Frontis- 

 piece, Figs. 28, 64, 65, 79.) 

 LEVEL ICE: (I.A.4.a.)— Flat ice. 

 LIGHT FLOE: (I.A.2.)— A floe that is less than two feet thick. See 



floe. 

 LIGHT ICE: (I.A.3.C.)— Ice less than two feet thick. 

 LILY PAD ICE: (I.A.2. or I.A.3.)— Pancake ice. 

 LOBATE: (II.A.3.C.) — Having lobes or rounded divisions, as the lobate 



terminus of a glacier (Fig. 69) . 

 LOBE: 



(1) (II.A.3.C.) — A rounded, marginal protuberance of piedmont ice 

 (Fig. 77). 



(2) (II.A.l.a.) — A great, rounded, marginal projection from a con- 

 tinental ice sheet. 



LOLLY ICE: (I.A.3.a.)— Frazil ice. 



LOOMING: (V.B.) — A common form of mirage. The appearance in the 

 sky or on the horizon of objects that are normally hidden below the 

 horizon is a common occurrence in the Far North. Images, sometimes 

 upside down, may appear well up in the sky, resting on a pedestal or 

 floating just above the horizon. The opposite, known as sinking, 

 causes nearby objects which should be in clear view to disappear. 



Looming may interfere with the identification of landmarks by dis- 

 tortion, may make estimation of vertical distances more difficult, may 

 cause icebergs to resemble ships, and may suddenly reveal one's own 

 craft to a distant observer. 



LOOSE ICE: (I. A. I.e.)— Broken ice. 



LOOSE PACK ICE: (I. A. I.e.)— Broken ice. 



MARGINAL CRUSHING: (I.A.4.f.)— The destruction of the outer edges 

 of ice cakes due to collision of the cakes (Fig. 23) . 



MEDIAL MORAINE: (II.B.)— A ridge of rock debris extending down 

 the central part of a valley glacier. Medial moraines are the lateral 

 moraines of tributary glaciers continuing down the main glacier. 

 Their number depends on the number of tributaries of which the main 

 glacier is built. (Frontispiece, Fig. 74.) 



MEDIUM FLOE: (I.A.2.d.)— A floe ranging in size from 600 to 3,000 

 feet across. See floe. (Figs. 18, 96.) 



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