SECTION V.. What Is a Glacier?

What is a glacier?

What is the extent of the glaciers of the Alps?

What change does the mass of snow in the higher valleys of the glacier mountains undergo?

What is the source of supply to the glacier?

What is the cause of the motion of the glacier?

What is the usual annual motion?

Why will the glacier melt but little at its under side?

Where will the waste at the surface just equal the addition?

What circumstances vary the position of the terminus of the glacier?

What, besides snow and ice, enters into the composition of a glacier?

How are these materials supplied?

How is a lateral moraine formed?

What effect has the motion of the glacier on the rocky surface over which it passes?

What is the material by which this effect is produced?

How is the terminal moraine produced?

How may the moraines on the Jura Mountains be explained?

How has it been proposed to explain the striated surfaces of rocks found in the north of Europe and America?

What is the objection to this extension of the glacier theory?

How does the ice accumulate along the coast in high latitudes to form icebergs?

Why does it ultimately separate from the shore?

How does it become freighted with earthy matter?

In what direction do the icebergs float, and why?

What are the dimensions of an iceberg, estimated from the part that is visible?

Where does the mass of ice increase, and where diminish?

What will be the effect of its melting?

How is it supposed that icebergs may have striated the rocky surface?

What is probably the condition of the bed of the seas over which icebergs now float?

Has the north of Europe and America been so depressed, during a period comparatively recent, as to admit of this explanation of the drift phenomena?