Plate Tectonics, Volcanoes, and Earthquakes - ISBN:1615301879

Plate Tectonics, Volcanoes, and Earthquakes

Date: 21 April 2011, 02:27

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Introduction:
Humans live on unsteady ground. This fact was
made abruptly apparent on January 12, 2010, when
a magnitude 7.0 earthquake devastated the Caribbean
island nation of Haiti. Because many buildings in this
impoverished country were poorly constructed, they
could not withstand the shaking and collapsed en masse,
particularly in the capital city of Port-au-Prince, 15
miles from the quake’s epicenter. Rescue workers desperately
combed through rubble, hunting for survivors.
By early February, Haiti’s prime minister estimated
that more than 200,000 people had been killed by the
earthquake’s effects. This type of earthquake, caused by
two separate sections, or plates, of the Earth’s crust
sliding against each other is known as a strike-slip
earthquake. It is just one example of the restlessness of
Earth’s surface.
This book will show how the movement of rock within
the Earth is explained by the theory of plate tectonics,
the idea that Earth’s outer layer is broken into moving
pieces. It will show how Earth adds and subtracts land
over time. In addition, it will explain how and why volcanoes
erupt and earthquakes shake the ground we live on.
As early as 1620, scholars noticed that the outlines of
continents could fi t together like puzzle pieces. In 1912,
German scientist Alfred Wegener fi rst explained the
concept of “continental drift.” He postulated that a single
supercontinent, which he called Pangea, once existed, but
broke apart into several pieces over geologic time.Wegener
cited the existence of similar types of rocks and fossils
found from separate continents as proof. He also used
continental drift to explain the evidence of major climate
and biological changes.....

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