Glaciers & Streams

Part 2

Glaciers & Streams

Part 2

Mr. KingMr. King

How Glaciers Move

Mountain Side

How Glaciers Move

Mountain Side

Cirque

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

Rock plucking & grinding

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which advances has more snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which advances has more snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which advances has more snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which advances has more snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which advances has more snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which recedes has less snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which recedes has less snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

Cirque

Where Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which recedes has less snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which recedes has less snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

How Glaciers Move

Mountain Side

CirqueWhere Snow Accumulates

Rock plucking & grinding

Rock & Silt pileTerminal Moraine

A Glacier which recedes has less snow accumulation than lowerMelting and evaporation.

Where snow melts orevaporates

Glacial tillOr milk in river

Glacial & Stream Erosion

• Glaciers erode a mountain side and create a “U” shaped valley

• Streams the flow down a steep gradiant or slope create a “V” shaped valley

Stream Erosion- Young

• Rapids • Waterfalls • No Flood Plain • Tributaries or small

streams connect main river

• Valley Being Deepened

Stream Erosion - Youth/Mature

• V-Shaped Valley

• Beginnings of Flood Plain

• Sand and Gravel Bars

• Sharp Divides

• Relief Reaches Maximum • Valleys stop deepening

Stream Erosion - Mature/Old age• Valley has flat bottom • Narrow Flood Plain • Divides begin to round off • Relief diminishes • Sediment builds up, flood

plain widens • River begins to meander • Lots of Disagreement from

here on; some geologists believe slopes stay steep but simply retreat.

Stream Erosion - Old Age

• Very Wide Flood Plain • Land worn down to flat

surface (Peneplain) • Resistant rocks form

residual hills (Monadnocks)

• Pronounced River Meanders

• Cut-off Meanders (Ox-bow lakes)

More Stream Erosion

• Rivers meander because the landscape is flat.

• Some Landscapes are flat because they are extremely ancient.

• Other Landscapes are flat for other reasons, like recent sediment deposition.

Rejuvenation of a stream

• Uplift of Land (Lowering of Sea Level, sometimes greater stream flow) causes stream to speed up and cut deeper.

• Stream valley takes on youthful characteristics but retains features of older stages as well.

• Can happen at any point in the cycle.

Streams - Can you Tell the Age?

AB

CD

Braided Stream