Glaciers Chapter 3 Section 4

Standards S 6.2a Surface water flow, glaciers, wind, and ocean waves have all been and continue to be active throughout California and the rest of the world in shaping landscapes. S 6.2a Surface water flow, glaciers, wind, and ocean waves have all been and continue to be active throughout California and the rest of the world in shaping landscapes.

Anticipatory Set

Vocabulary Glacier Glacier Continental glacier Continental glacier Ice age Ice age Valley glacier Valley glacier

Plucking Plucking Till Till Moraine Moraine Kettle Kettle

How Glaciers form and Move 2 types of glaciers. 2 types of glaciers. Continental glaciers – covers most of a continent or large island. Continental glaciers – covers most of a continent or large island. Valley glaciers- long, narrow glacier that forms when snow and ice build up. Valley glaciers- long, narrow glacier that forms when snow and ice build up. Glaciers have been found in Antarctica and Greenland. Glaciers have been found in Antarctica and Greenland. They flow in all directions They flow in all directions

Valley/ Continental Glacier

Ice Ages have occurred and have covered large parts of the Earth’s surface. Ice Ages have occurred and have covered large parts of the Earth’s surface. Glaciers will advance, retreat, or melt back. Glaciers will advance, retreat, or melt back. Glaciers can only form in an area where more snow falls than melts. Gravity will begin to pull down the glacier. Glaciers can only form in an area where more snow falls than melts. Gravity will begin to pull down the glacier. They move a few centimeters a day. They move a few centimeters a day.

2 processes that glaciers erode the land are plunking and abrasion 2 processes that glaciers erode the land are plunking and abrasion Plunking- as it moves across the land, it picks up rocks. It can even move large boulders. Plunking- as it moves across the land, it picks up rocks. It can even move large boulders. Abrasion: gouges and scratches the bedrock. Abrasion: gouges and scratches the bedrock. A U shaped valley will be created that demonstrates that a glacier once covered the area. A U shaped valley will be created that demonstrates that a glacier once covered the area.

When a glacier melts, it deposits the sediment it eroded from the land, creating various landforms. When a glacier melts, it deposits the sediment it eroded from the land, creating various landforms. If the sediment has been deposited directly on the surface it is called till. If the sediment has been deposited directly on the surface it is called till. The till deposited on the edges of a glacier forms a ridge called a moraine. The till deposited on the edges of a glacier forms a ridge called a moraine. Terminal Moraine: the ridge of till at the farthest point reached by a glacier. Terminal Moraine: the ridge of till at the farthest point reached by a glacier.

Terminal Moraine

A kettle is a small depression that forms when a chunk of ice is left is left in glacial till. A kettle is a small depression that forms when a chunk of ice is left is left in glacial till.

Checking for Understanding What is a continental glacier? What is a continental glacier? What is a valley glacier? What is a valley glacier? How does a glacier form? How does a glacier form? How does a glacier move? How does a glacier move?

Guided Practice Independent Practice Guided Practice: page # 1-22 Guided Practice: page # 1-22 Independent Practice: Glacier Worksheet Independent Practice: Glacier Worksheet