Reading Comprehension

I. The following passage has been jumbled. Read it and reorganize the paragraphs into their logical order.

A. Along the sides of the glaciated valley, it is quite possible to find rocks of foreign origin. These rocks have been carried down by the glacier. When the glacier disappeared from the valley, these huge rocks called rocking stones were left behind, lying in rather precarious positions. The rocking stones are perched so uncertainly that it may seem to one that they would roll downhill should someone touch them.

B. At its source, a glacier is broad and thick: but as it moves down the mountain, its temperature rises. As a result, more snow and ice melt and the glacier gradually in size. The surface of the glacier is often uneven due to crevasses or cracks in the ice. These cracks are formed when the glacier moves over a rough surface. A glacier also picks up rocks and stones along its route, and these also make the surface uneven. These rocks fragments are deposited as ridges called moraines when the ice melts

C. The great weight of a glacier causes it to move slowly downwards from the snowfield where it was formed. The movement varies from a few centimeters to a few meters per day, depending on, the slop of the ground and the presence of obstructions. The movement is greater in the center along the surface of the glacier than at the sides and the bottom. In some regions, the glacier eventually reaches the sea. Large chunks of it break off and fall into the sea with a thundering roar. These chucks of ice gloat away as icebergs.

D. A glacier is a river of ice that travels slowly from the summit of a mountain to the valley below. It is formed when masses of snow are frozen and pressed together. For a glacier to form, snowfall during winter must exceed the melting of snow during summer. Such conditions only prevail in the mountain and polar regions.

E. When glaciers disappear from a vally, they leave behind characteristic features. The...