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?
Fig. 78.