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?
SECTION VI.
What is the condition of the interior of the earth with respect to heat?
How do the observations made in deep mines and wells prove this?
How far is the temperature influenced from the surface?