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Books > Science & Mathematics > Astronomy, space & time > Solar system
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Catastrophes and Lesser Calamities - The causes of mass extinctions (Paperback, New ed)
Price: R190
Discovery Miles 1 900
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Catastrophes and Lesser Calamities - The causes of mass extinctions (Paperback, New ed)
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Price R190
Discovery Miles 1 900
Expected to ship within 2 - 4 working days
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This is a book about the dramatic periods in the Earth's history
called mass extinctions - short periods (by geological standards)
when life nearly died out on Earth. The most famous is the mass
extinction that happened about 65 million years ago, and that
caused the death of the dinosaurs. But that was not the worst mass
extinction: that honour goes to the extinction at the end of the
Permian Period, about 250 million years ago, when over 90% of life
is thought to have become extinct. What caused these catastrophes?
Was it the effects of a massive meteorite impact? There is evidence
for such an impact about 65 million years ago. Or was it a period
of massive volcanic activity? There is evidence in the rocks of
huge lava flows at periods that match several of the mass
extinctions. Was it something to do with climate change and sea
level? Or was it a combination of some or all of these? The
question has been haunting geologists for a number of years, and it
forms one of the most exciting areas of research in geology today.
In this book, Tony Hallam, a distinguished geologist and writer,
looks at all the different theories and also what the study of mass
extinctions might tell us about the future. If climate change is a
key factor, we may well, as some scientists have suggested, be in a
period of mass extinction of our own making.
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