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Chapter 3 Section 2: Glaciers Objective!!! Chapter 3 Section 2: Glaciers You will learn to explain how glaciers move. You will learn to describe evidence of glacial erosion and deposition. You will learn to compare and contrast till and outwash.

_______ form in regions where snow accumulates. When snow doesn’t melt, it piles up. As it accumulates slowly, the increasing weight of the snow becomes great enough to compress the lower layers into ____. Glaciers ice

The mass slowly begins to flow in a thick, ________ lower layer, and ice slowly moves away from its source. A large mass of ice and snow moving on land under its own weight is a ______. plasticlike glacier

_______ are agents of erosion. As glaciers pass over land, they erode it, changing features on the surface. Glaciers then carry eroded material along and _______ it somewhere else. Glaciers deposit

When glacial ice melts, water flows into cracks in rocks When glacial ice melts, water flows into cracks in rocks. Later, the water refreezes in the cracks, expands, and fractures the rock. What is this process called? __________ ice wedging

Pieces of rock then are lifted out by the ice. This process, called ________, results in boulders, gravel, and sand being added to the bottom and sides of a glacier. plucking

plucking Marks from _______, called ______, are deep, long, parallel scars on rocks. Shallower marks are called _______. grooves striations

______ Plucking Ice wedging occurs Breaks rock apart Lifted by glacier Scrapes soil & bedrock Leaves marks called ________ and _________ grooves striations

____ Till Boulders, sand, clay, & silt dropped from the base of a glacier when it slows down.

Because of this, a big ridge of material piles up. Till ___ is also deposited at the end of a glacier when it is not moving forward. Rocks and soil are moved to the end of the glacier, much like items on a grocery store conveyor belt. Because of this, a big ridge of material piles up. Such a ridge is called a ______. moraine

Rocks and soil the glacier pushed along; ridge of materials. Moraine _______ Rocks and soil the glacier pushed along; ridge of materials.

The material deposited by ________, or water from a melting glacier Outwash meltwater

Outwash can deposit sediments in two ways… 1. __________ 2 Outwash can deposit sediments in two ways… 1. __________ 2. ________________ (ESKERS) fan-shaped long, winding ridges