Question

3 Dips in the summit line of mountain ranges fromed by erosive action glaciers are called ​

Answer 1

Explanation:

lava – A type of basaltic lava (material) having a rough, jagged, clinkery surface and a vesicular interior.

Compare – block lava, pahoehoe lava, pillow lava. GG & MA

aa lava flow – A type of basaltic lava flow dominated by aa lava and a characteristically rough, jagged, clinkery

surface. Compare – block lava flow, pahoehoe lava flow, pillow lava flow. GG & MA

ablation till – (not preferred) refer to supraglacial till.

accretion – [sedimentology] The gradual increase or extension of land by natural forces acting over a long period

of time, as on a beach by the washing up of sand from the sea or on a flood plain by the accumulation of sediment

deposited by a stream. Synonym: aggradation. GG

active layer – The top layer of ground subject to annual thawing and freezing in areas underlain by permafrost.

NRC

active slope – (not recommended: obsolete)

aeolian – (not recommended: obsolete) use eolian.

aggradation – The building-up of the Earth's surface by deposition; specifically, the accumulation of material by

any process in order to establish or maintain uniformity of grade or slope; also called accretion. Compare –

degradation. GG

alas – A type of thermokarst depression with steep sides and a flat, grass-covered floor, found in thermokarst

terrain, produced by thawing of extensive areas of very thick and exceedingly ice-rich permafrost. Compare –

thermokarst depression. NRC and GG

alluvial – Pertaining to material or processes associated with transportation and/or subaerial deposition by

concentrated running water. Compare – colluvial. GSST

alluvial cone – A semi-conical type of alluvial fan with very steep slopes; it is higher, narrower, and steeper

(e.g., > 40% slopes) than a fan, and composed of coarser, and thicker layers of material deposited by a

combination of alluvial episodes and to a much lesser degree, landslides (e.g., debris flow). Coarsest materials

tend to concentrate at the cone apex. Compare – alluvial fan, talus cone. SW

alluvial fan – A low, outspread mass of loose materials and/or rock material, commonly with gentle slopes,

shaped like an open fan or a segment of a cone, deposited by a stream (best expressed in semiarid regions) at the

place where it issues from a narrow mountain or upland valley; or where a tributary stream is near or at its

junction with the main stream. It is steepest near its apex which points upstream and slopes gently and convexly

outward (downstream) with a gradual decrease in gradient. GG

alluvial flat – (a) (colloquial: western USA) A nearly level, graded, alluvial surface in bolsons and semi-bolsons

that lacks distinct channels, terraces, or flood plain levels. Compare – flood-plain step, terrace, valley flat. FFP,

GG, & SW. (b) (not preferred) A general term for a small flood plain bordering a river, on which alluvium is

deposited during floods. GG

alluvial plain – (a) A large assemblage of fluvial landforms (braided streams, terraces, etc.

Answer 2

Alpine glaciers are also called valley glaciers or mountain ... An where three or more glaciers meet to form a peak is called a horn.

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