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.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1993
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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.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1998
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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.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1993
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