Have you read page 83?

Apparently, the volcanic eruption expelled such a
significant mass of molten rock that the resulting
vacuum beneath the crust of Earth caused great areas of
the land masses to sink below the oceans. The
continental areas occupied by both civilizations were
covered with volcanic matter, and then submerged,
leaving very little evidence that they ever existed
except for legends of a global flood which prevail in
every culture of the Earth, and for survivors who are
the genus of oriental races and cultures.
That kind of colossal volcanic explosion 130 (Footnote) fills
the stratosphere with toxic gases which are carried
around the whole planet. The usual refuse of these
volcanic eruptions can easily cause a rain that lasts
for "40 days and 40 nights" due to atmospheric pollution
as well as an extensive period during which radiation
from the sun is deflected back into space, and cause
global cooling. 131 (Footnote) Certainly such an event would
cause an ice age, extinctions of life forms and many
other relatively long-term changes lasting thousands of
years.
Due to the myriad types of naturally occurring global
cataclysmic events which are indigenous to Earth, it is
not a suitable planet for habitation by IS-BEs. In
addition there have been occasional global cataclysms
caused by IS-BEs such as the one that destroyed the
dinosaurs 132 (Footnote) more than 70 million years ago. That
destruction was caused by intergalactic warfare during
which time Earth, and many other neighboring moons and
planets, were bombarded by atomic weapons. Atomic
explosions cause atmospheric fallout much like that of
volcanic eruptions. 133 (Footnote) Most of the planets in this
sector of the galaxy have been uninhabitable deserts
since then