1. Glaciers
Pg. 79

2. Moving masses of ice Glacier- large moving mass of ice
Form near earth’s poles
Cover about 10% of Earth
In places like Greenland, temps never get warm enough to melt all the snow
The snow accumulates in areas called snowfields
Keeps growing until a glacier forms
Classified as either valley or continental glaciers

3. Valley Glaciers Form in valleys in high mountainous regions
Begins to move when it becomes too large (exceeds 20 m thickness)
Carves v shaped valleys into u shaped valleys

6. Continental Glaciers Cover broad areas Thickest at the center
Also called ice sheets
Confined to Greenland, northern Canada, and Antarctica

8. Glacial Erosion Most powerful agent of erosion
Breaks off pieces of rock, called plucking
Rocks attach to the side of glaciers and aid in erosion
Can also break off pieces of rock at the bottom of the glacier and scratch the land beneath (called abrasion)
Small scratches called striations; large called grooves (provide glacial history)
Carve deep depressions called cirques
Where 2 cirques meet, a steep ridge called an arête forms
Friction determines rate of flow

9. Glacial Deposition
Mixed debris that glaciers carry is called glacial till
Ridges containing till deposits are called moraines (Long Island is a terminal moraine left from the last ice age)
Sometimes they form lakes called kettle lakes
The great lakes are formed from moraine- dammed valleys

11. Pg. 80
Complete the science and math activity and attach it as a flap to page 80.
Be sure to answer all questions
Use a sticky note graph paper for number 2 under the Challenge section