cr own readers

ABOUT ICEBERGS.
4 5
AS
ARCTIC GLACIER.
11. ABOUT ICEBERGS.
1. The whole interior of Green land is covered with
an immense ice-cap, many hu ndred fect in thickness.
Evon in summer the heat of the sun is powerless to
mclt this mass, which only freezes into great er solidity
when thut heat is withdrawn. Th e immense pre ure
of the new snowfall of each ycar helps to turn the
lower parts into solid ice.
2. Th e gr cat weight of snow also acts a a propelling
power, and forces the icy stream down the
valleys towards the COl1.8t, where it app cars as an