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The core-mantle boundary

Article Abstract:

The area between the upper part of the earth's core and the lower part of the mantle is a geologically active region that can affect processes such as the earth's rotation. Seismic tomography illustrates variations in the velocities of seismic waves in the interior of the earth.

Author: Jeanloz, Raymond, Lay, Thorne
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1993
Cover Story, Seismic tomography

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The earliest views

Article Abstract:

The discovery of single-lens microscopes, such as those introduced by Antony van Leeuwenhoek and Robert Brown, laid the foundation for modern microbiology and microscopy. These instruments were used by scientists in the 1980s to view species in greater detail.

Author: Ford, Brian J.
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1998
History, Microbiology, Microscope and microscopy, Microscopes, Microscopy, Electron microscopes

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The earliest history of the Earth

Article Abstract:

Advances in radioactive dating techniques are enabling scientists to acquire new information about the earth's formative years. For example, scientists are learning more about the formation of the continents and the operation of plate tectonics.

Author: York, Derek
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1993
Physical geology, Radioactive dating, Radiometric dating

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Subjects list: Research, Earth, Structure, Usage
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