| A | B |
|---|
| glacier | mass of moving ice |
| snowfield | an almost motionless mass of permanent snow & ice |
| How does a glacier form? | when snow and ice accumulate to a great enough thickness that the ice starts to move downslope due to gravity. . |
| valley glacier | found in moutainous areas - a long, narrow wedge-shaped mass of ice that moves down the valley. example: Alps, Andes, Himalays Mountains |
| continental ice sheets | mass of ice that covers millions of square kilometers. Examples: Greenland, Antartica |
| internal plastic flow | when solid ice crystals slip over each other, causing a slow forward motion. |
| lateral moraine | moraine found on the sides of a glacier |
| kettles | depression formed when buried ice melts |
| eskers | long, winding ridge formed by melt water |
| terminal moraine | moraine found at the end of a glacier |
| cirque | bowl shaped depression carved by a glacier |
| horn | a sharp pyramid-like peak |
| till | jagged, unsorted deposits left by a glacier |
| aretes | French for spines; sharp jagged ridges |
| crevasses | large cracks formed within a glacier |
| erratics | large boulder moved by a glacier |
| medial | moraine formed when two glaciers merge |
| What happens to the sea level during an ice age? | It goes down quite a bit |
| glaciers formed in mountainous areas are called | valley glaciers |
| Antarctica is covered by the earth's largest | continental ice sheet |
| a glacier will move by sliding when the base of the ice and rock are separated by a thin layer of | water |
| when a glacier moves by internal plastic flow | its center moves fastest |
| Glacial erosion may produce a bowl-shaped depression known as | a cirque |
| As a glacier moves through a valley, it carves out | a U-shape |
| Unsorted glacial deposits are called | till |
| Long, winding ridges of gravel and sand deposited by a melwater stream under the ice are called | eskers |
| A kettle is a | depression |
| A deposit of stratified drift is called | outwash |
| During the last glacial period, the average temperture was about | 5 degrees lower than today |
| A proposed cause of the ice ages is decreased solar energy reaching the earth due to | blockage by volcanic dust |
| Long Island, New York is an example of | a terminal moraine |
| Today, the Great Lakes drain through the | St. Lawrence River |
