Title: The
Earth – An Intimate History
Author: Richard Fortey
Publisher: Harper Perennial, 2005
(First published 2004)
ISBN: 0-00-655137-8
Pages: 477
Geology is a science which enters
the imagination of the society typically after an earthquake, tsunami or a
similar catastrophe against which the vulnerability and helplessness of human
technology is so painfully evident. When the forces that lay concealed among
the deep earth shakes up from slumber there is not much we can do except
evacuating people from the surface. Richard Fortey is a research scientist at
the Natural History Museum and a Fellow of the Royal Society. The Earth
is a timely and relevant initiative from the geologist to make the public aware
of geology in general and the earth itself in particular. We read about the
great upheavals on the surface of earth occasioned due to deep movements at the
plate level underneath, which are always moving about on top of the mantle,
albeit very slowly – at the pace of your finger nails grow, as the author says.
The book is quite impressive to read and has attracted appreciative review from
many, including Bill Bryson who praised it as ”dazzling and the author was
without peer among science writers”. The second part of the comment is a
bit audacious, but there is no arguing about the first.
Volcanoes are the objects of
curious attention of people of all ages, and tinged with a shade of awe at the
tremendous magnitude of forces at work. Fortey begins his travels and
investigations from Naples, Italy where the most notorious volcano in history
is located, Mount Vesuvius. Its eruption in 79 CE had obliterated Herculaneum
and Pompeii whose remains are still visible near the city. But Vesuvius is now
dormant and the spectators are denied the glory of subterranean forces. So the
author takes us to Hawaii Islands where volcanoes coexist with paradise-like
beaches. Here, we can witness molten lava falling to the sea, which makes a
fearful sight to behold. The author has succeeded in painting a true picture in
words without losing the majesty of the next wonder of geology – plate
tectonics. Hawaii is an archipelago containing a chain of volcanic islands.
However, the active volcano exists in only one island at a time. Gradually, the
volcanic activity ceases in one island and moves on to another point in the
chain which have just become visible over the waves. Thus new islands are
formed and volcanoes shift their positions to them. The reason behind this
transfer of volcanism is explained by plate tectonics. The mantle plume, which
transfers molten lava from the earth’s interior to the crust is stationary, but
when the plate moves over the plume, a volcano is formed. The movement of the
plate is very slow, at a rate of 2.5 to 15 cm in a year. But when aggregated
over geological time, the movement is considerable and the volcanism seems to
shift to other islands.
The mandate of geology runs
supreme in alpine peaks and the rugged terrain of Newfoundland. Fortey explains
the concepts behind the formation of the great mountain chain of Alps with
several plates to illustrate and his extensive explorations in those areas act
as a beacon to guide the readers. We read about a supercontinent, Pangaea which
broke up to create the continents we see today. This breakup and agglomeration
is not unique in geological annals. Even before the continent of Pangaea was formed,
there were still ancient oceans which separated distinct land masses. When
those continents came together to become a single one, a mountain generally
originated where the sea has been. Fortey identifies such a vanished ocean as
Iapetus whose remains are still seen as a rocky outcrop rich in minerals that
run through Central Europe. The Ural Mountain in Russia is also a remnant of
such a sea disappeared long ago. But not all mountains are derived from a
subduction zone created when the oceanic plate slides under the thick
continental plate. This turns our attention again to plate tectonics, the
single most revolutionary idea that catalyzed the pace of research in geology.
Though the idea came in the 1920s through the works of Alfred Wegener, it was considered
an obscure one by prominent geologists in the field. In the 1960s, the theory
was resurrected with incontrovertible evidence in its favour. We now know for
sure that the Himalayan mountain chain is the product of the buckling of the
crust as a result of Indian plate pushing on to the Asian plate.
The author does not leave out any
feature of the earth’s surface without pausing to reflect on it. His in-depth
experience of rocks makes itself astonishing to the readers. Not content with
what he sees on the crust, we are invited for a tour to the innards of our home
planet. We encounter a solid metallic core deep inside, surrounded by molten
metals and alloys under unimaginably high pressure, followed by a mantle and
finally, a crust. The wonders hidden inside the earth never for a moment fail
to amaze us.
A lot of colour plates
illustrating the geological backbone of the ideas discussed in text is a great
help for lay readers to visualize. We have no option to appreciate the wide
ranging travels undertaken by the author as part of his academic career and in
preparation of this book. However, the language become terse at many points in
proportion to the complexity of processes and events under discussion. Some of
us may fail to appreciate the finer distinctions between various kinds of rocks
of which the author is very excited about. Though Fortey has tried his best to
illuminate a portion of the highly technical field of geology, we are still
left with a sense of lost opportunity. Even with all those illustrations and
photographs, general readers still struggle to follow the author at many
points. This is definitely not a drawback on the author’s style, but due to the
nature of the subject.
The book is highly recommended.
Rating: 3 Star