PPT-Glaciers A glacier is a thick ice mass that forms over hundreds or thousands of years.

It originates on land from the accumulation compaction and recrystallization of snow A glacier appears to be motionless but glaciers move very slowly Glaciers are dynamic weathering and erosional . January 21, 2011. . Glaciers act as agents of erosion and deposition to help to create unique landforms which you will study in this unit. Glacier. : A large mass of ice resting on land or floating as an ice shelf in the sea adjacent to land. Glacial Ice. . Once . glacial ice exceeds a thickness of about 150 feet, the weight of the overlying ice causes . the . base of . the glacier . to become plastic and flow like a very viscous liquid. While the bottom ice responds as a plastic solid, the surface ice is very brittle. However, from the surface down to the top of the plastic portion of the glacier, the ice experiences a decrease in . Jeremy . Fyke. , Bill Lipscomb. Los Alamos National Laboratory. Goal: Simulate the coupled evolution of Arctic glaciers and ice caps. . within RASM. Evolving land ice . area. . A. ffects vegetation extent and albedo. Chapter 7.1. At one time nearly 30% of the earth’s surface was covered in ice. . . This . period of time was referred to . as the . ice age. .. Today. , only . 10% of the earth’s surface is covered in ice. Finish South Asia. Nepal: Everest Region. Glacier Lake Outburst Floods. 1999 Slides. Summary of Observed Glacier Changes. Sketch Maps Due on Wednesday!. For . Next Class: Read Chapter 13 (pp. 588-598). 5.7B. Thinking About Glaciers. Glaciers cover about one-tenth of the Earth’s surface. Most of the fresh water found on the Earth is frozen in glaciers.. Glaciers move very slowly and can cause very slow changes to the Earth’s surface.. More winter snowfall than summer melt. Glacier formation is similar to sedimentary rock formation. Types of Glaciers. Valley glaciers or alpine glaciation. Ice sheets or continental glaciation. Glaciers of the world. Glacier – thick ice mass that forms over hundreds or thousands of years.. 15, 000 years ago > 30 % coverage - Today 10 % coverage. Valley Glaciers. Ice Sheets. Types of Glaciers. Valley Glaciers. Agent . of . weathering, erosion, and deposition . – acquire, transport and deposit sediment. Occupy ~10% of land area. “Interrupts” hydrologic cycle by “locking up” water. Glacier. GLACIERS. 1. Mass Movement. A down . slope movement of loose sediment and weathered rocks resulting from the force of gravity..  Erosion following weathering climatic conditions determine which materials and how much. 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 glaciers. Continental Glaciers. A . continental glacier. Taku Glacier 2 Calculate the gradient of the Taku Glacier from 1000 ft Once . glacial ice exceeds a thickness of about 150 feet, the weight of the overlying ice causes . the . base of . the glacier . to become plastic and flow like a very viscous liquid. While the bottom ice responds as a plastic solid, the surface ice is very brittle. However, from the surface down to the top of the plastic portion of the glacier, the ice experiences a decrease in . Use has been made of existing manuals for mass balance measurements and. glossaries presenting definitions (Ostrem and Brugman, 1991; Kaser et al., 2003;. Cogley et al., 2011).. Descriptions in chapter are also based on more recent publications (reports, .