Mysterious rock formations…….. What could have caused these formations? GLACIERS!!!!!

Slides:

Advertisements

Similar presentations

Glaciers and Long Island

Advertisements

GLACIERS In the following presentation you are going to see some actual pictures of glaciers and landforms resulting from glacial movement. Some key words.

Glaciers Chapter 8, Section 2.

GLACIAL LANDFORMS SHAPE MOUNTAINS

By: Ryan Alex Scott Whit Louie

Glaciation of Canada.

Erosion: Deposition: AIM: Erosional and Depositional systems

  Glacier: thick mass of ice, forms over land  Compaction and recrystallization of snow  Glacier Types: Glacier Types:  Valley (alpine) glaciers –

Chapter 7.1.  At one time nearly 30% of the earth’s surface was covered in ice. This time period was known as the ice age.  Today, only 10% of the earth’s.

Form in high mountains where snow accumulates to sufficient depths so that it is compressed, compacted and recrystallized. For this reason glacial.

Glacial Geomorphology Lab 10. Concepts Glacier Formation Accumulation and Ablation, Sublimation Movement Glacial Mass Balance Categories of Glaciers Where.

What is a Glacier? REVIEW = An accumulation of compacted snow & ice

Erosion and Deposition by Glaciers Created By: Belinda Schmahl.

Charity I. Mulig.

Glaciers and Glacial Landforms

 As glaciers travel over land, glacial ice can erode the underlying bedrock.  This erosion can happen by:  Plucking  Abrasion.

CHAPTER 5 HONORS EARTH SCIENCE

Glaciers. A GLACIER forms when yearly snowfall in a region far exceeds the amount of snow and ice that melts during the summer months. Most of the world's.

GLACIERS CHAPTER 5 HONORS EARTH SCIENCE. What is a glacier? a thick mass of moving ice

Chapter 5: Section 2 Surface Processes and Landscapes

8.3 Glaciers Types of glaciers Alpine Small glaciers that form valleys

Earth Science 7.1B Glaciers. Glacial Erosion  Glaciers are natures bulldozers. Their massive force tears rock from valley floors and walls carrying the.

‘S‘S. VOCABULARY GLACIER - LARGE MOVING MASS OF ICE THAT FORMS NEAR EARTH’S POLES AND IN MOUNTAINOUS REGIONS AT HIGH ELEVATIONS. GLACIER - LARGE MOVING.

Glacial arete and col. drumlin valley glacier and medial moraines.

Chapter 3 Section 4 Glaciers. Moving mass of ice and snow Form when more snow falls than melts Agent of erosion.

GLACIERS What is a glacier? Large volume of ice on land Doesn’t melt in the summer Ice moves and flows with the pull of gravity What does it take? Very.

Glacial Landforms 1.Alpine erosional landforms 2.Alpine depositional landforms 3.Continental glacial landforms (erosional and depositional.

Glaciers and Erosion Glacier = Large moving mass of ice and snowmovingice Alpine vs. Continental Glaciers.

Unit 1: Land and Water Forms Glaciers as Agents of Erosion

Ch 15: p  Enormous masses of moving ice created by the accumulation and compaction of snow.  Powerful agents of erosion ~ have carved some.

Glaciers Glaciers formed much of the landscape that exists presently in the northern United States and elsewhere in the world. Glaciers Today, scientists.

GLACIERS AND GLACIATION. GLACIER A body of ice Formed on land Recrystallization of snow=> Firn => Ice Evidence of movement Alpine (valley) glaciation.

Glaciers We wouldn’t be here without them.. A Glacier is an accumulation of snow that is large enough to survive the summer melt. These large ice masses.

GLACIATION About 15 million square kilometres of the earth’s surface are currently covered with glaciers.

An introduction to where, how, and why glaciers form

Glacial Erosion and Deposition. Erosion Glaciers have the capacity to carry huge rocks and piles of debris over large distances They grind out parallel.

Guided Notes For Glaciers Section 8.3. Glaciers shape the landscape by eroding, transporting, and depositing huge volumes of rock and sediment.

Geologic Features of Glaciation

Glacial Landscapes Glacier = large moving mass of ice. Glacier = large moving mass of ice. Glaciers erode, transport and deposit massive amount of sediment.

Glaciers Section 9.4. Glaciers are any large mass of ice that moves over land Continental Glaciers - cover much of a continent or large island (10% of.

Glaciers. Geologists define a glacier as any large mass of ice that moves slowly over land. There are two types of glaciers: Continental glaciers Valley.

More Erosion Or... you’re really wearing me down..

AIM: How do Glaciers change the landscape? Do Now:

GLACIERS AND GLACIATION. GLACIER A body of ice Formed on land Recrystallization of snow=> Firn => Ice Evidence of movement Alpine (valley) glaciation.

Glaciers We wouldn’t be here without them.. A Glacier is an accumulation of snow that is large enough to survive the summer melt. What are glaciers?

Chapter 8 Erosional Forces Section 8-2 Glaciers Note Guide.

Study Guide Chapter What is a glacier? 2.Distinguish between alpine and continental glaciation. 3.Explain how a glacier moves. Explain how a crevass.

Glaciers & Glaciation. Glaciers Glacier: a large, long-lasting mass of ice, formed on land that moves under the influence of gravity and its own weightGlacier:

UNIT 5WEATHERING: (B) GLACIERS Glacier-large long-lasting mass of snow compacted & recrystallized, first into firn then glacial ice. Glaciers part of hydrosphere.

Glacier: Any large mass of ice that moves slowly over land.

Glaciers. “ RIVERS OF ICE ” Mass movement of frozen ice on land Mass movement of frozen ice on land Form at high elevations or high altitude Form at high.

Aim: How do glaciers move? Topic: Glaciers DN: 1.How does wind move sand? 2.Why are rocks eroded by wind more eroded at the base of the rock than.

GLACIAL LANDFORMS SHAPE MOUNTAINS Surface features subglacial erosional depositional.

D. Evan Stribling  a larger mass of compacted snow and ice that moves under the force of its own gravity (weight)  They erode in some places deposit.

Glaciers once covered most of the Earth –in total there have been up to 22 times when glaciers covered large areas of the Earth… including Alberta the.

Chapter 7.1b Glaciers.

Ice, Ice, Baby! Glaciers and Glacial Features Photo Source:

Alaska from space.

Glacier Review.

Like running water, gravity is the driving force

Aim: How do Glaciers affect the land?

GLACIERS A LARGE MASS OF ICE ON LAND THAT FLOWS UNDER THE PRESSURE OF ITS OWN WEIGHT – DOWNHILL OR OUTWARD DUE TO GRAVITY.

Earth Science Chapter 8 Section 3

Presentation transcript:

Mysterious rock formations…….

What could have caused these formations? GLACIERS!!!!!

Evidence for Glaciers  Erratics  Unsorted material  Striations  Polished Bedrock

Erratic

Erratic  Boulder-sized rock dumped by a glacier  Rock is different type than surrounding rocks

Unsorted Materials- all sizes mixed together.

Striations

Chatter marks (Maine)

Striations/ Chatter marks  Grooves carved into bedrock  Formed by abrasive action of cobbles and pebbles carried at bottom of glacier  Direction of scratches shows direction glacier moved

Glacial polish  Smooth rock surfaces  Created as glaciers flow over bedrock

Glacial Pavement….

What does a glacier look like?

What conditions are necessary for glacial formation?  Cold Summers!!  Located above the snow line, or in polar regions.  Presently occupy 10 % of world’s total land area (32% during ICE AGES)  Form on all continents BUT Australia

Process of Glacier Formation  Snow does NOT melt in summer  Recrystallization of snow to form LARGE crystals of ice (rough and granular) –called FIRN: liked packed snowballs  Lower layers turn to SOLID ICE under the weight of overlying firn and snow.

Snow becomes Firn

 Glaciers: Types  VALLEY GLACIERS:  long, slow-moving, wedge-shaped streams of ice  Bordered by mountains  Size varies*  small= 1-2 km long, 100’s m wide, 100’s m deep*  largest = Over 100km’s long X 100’s m deep

 CONTINENTAL GLACIER (ICE SHEETS):  very old (1000’s of years) and thick (1000’s of meters)  Not confined by mountains  Examples:  GREENLAND: 1.7 million square miles, 2 miles thick  ANTARCTICA: 12.5 million square miles, 3 miles thick

Features associated with valley (alpine) glaciers

Original valley (V-shaped) Glaciers come and alter landforms Glaciers retreat and new features appear

Landscape Features- Valley Glaciers  CIRQUES:  semi-circular shaped bedrock feature  created as a glacier scours back toward the mountain

 ARÊTES:  steep-sided, sharp-edged bedrock ridge  formed by two glaciers eroding away on opposite sides of a ridge

CIRQUE TARN TARNS: glacial lakes produced by glacial scouring often found in cirques

 HORNS:  3 or more cirques adjacent to one another

Hanging Valley

ARÊTE CIRQUE HANGING VALLEY U-SHAPED VALLEY

U-shaped valley

CONTINENTAL GLACIERS FEATURES

Lateral moraine

 MORAINES: material left behind when glacier recedes

 When glacier retreats (melts) rock and sediments are dropped behind  Long Island, Cape Cod and the islands are part of a terminal moraine

Kettle Lake Till Drumlins Terminal Moraine Glacial Stream Moraine-dammed lake Outwash plain Esker

Drumlin

drumlins

Kettle Lakes

River in glacier carries sediment Glacier melts Drops sediment Esker results

Eskers