Crater density used relative dating

24-Aug-2017 01:10

With the acceleration of scientific advancements during the last two decades, many of these facts have to be set into a new theoretical framework, one that takes into account the new perspective that Earth is a planet, a member of a diverse community of worlds orbiting the Sun.Figure 8.1 Views of Earth from space are dominated by the ocean and the swirling patterns of clouds, underlining the importance of water in Earth's geologic systems.Repeated cycles of ocean basin formation and closing shaped the present appearance of the planet's surface.

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Contrasting beautifully with the azure blue are the white streamers of clouds and the massive ice cap of Antarctica.The evidence comes largely from studies of the physical characteristics of the planet itself---its density, the way in which it transmits seismic (earthquake) waves, the nature of its magnetic field---and from comparisons with meteorites.Although these methods of study do not always provide absolute answers, they do indicate the limits of possibilities of what the interior of a planet may be.Almost without our realizing it, the tools for space studies have brought about a new age of rediscovery of the planet Earth itself.Viewed from space, Earth presents a fascinating range of surface features (Figure 8.1).

Contrasting beautifully with the azure blue are the white streamers of clouds and the massive ice cap of Antarctica.The evidence comes largely from studies of the physical characteristics of the planet itself---its density, the way in which it transmits seismic (earthquake) waves, the nature of its magnetic field---and from comparisons with meteorites.Although these methods of study do not always provide absolute answers, they do indicate the limits of possibilities of what the interior of a planet may be.Almost without our realizing it, the tools for space studies have brought about a new age of rediscovery of the planet Earth itself.Viewed from space, Earth presents a fascinating range of surface features (Figure 8.1).They are created and modified by a distinctive tectonic style called plate tectonics that reflects the style of convection in the upper mantle.