The Hydrologic Cycle 3: Glaciers. Glaciers contain 76% of all the Freshwater on Earth!

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Transcript of The Hydrologic Cycle 3: Glaciers. Glaciers contain 76% of all the Freshwater on Earth!

The Hydrologic Cycle 3: Glaciers

Glaciers contain 76% of all the Freshwater on Earth!

Two Types of Glaciers:1) Continental Ice Sheets

A) Antarctica

Ice Shelf

B) Greenland

Antarctic Ice Sheet

Two Types of Glaciers:2) Valley Glaciers

What are Glaciers?

Highly compacted snow becomes glacial ice

Glaciers Move – Solid Ice Can Flow !

How do Glaciers Flow ?1) Basal sliding

How do Glaciers Flow ?2) Internal Plastic Flow

The Glacial Budget

Two Different Types of Glacial Landforms: 1) Erosional

Before Glaciation

Glaciation

Glacial Landscape

U – Shaped Valleys – near Sun Valley, Idaho

UD Geology Field Camp: West Chicago CreekU-Shaped Valley with Pater Noster Lakes

Cirque - Bowl Shaped Depression Carved By a glacierTarn – A small lake filling a Cirque.

Horns – Pyramid Shaped MountainsAretes – Linear Mountain Ridges

Dr. Goldman in the Grand Tetons, August 2000

Yosemite Falls:A Hanging Valley

How do Glaciers Erode Bedrock?1) Plucking

Roche Moutonee

How do Glaciers Erode Bedrock?2) Abrasion - Glacial Striations