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Based on this brief literature survey, we may conclude that volcanic CO is exclusively anthropogenic.

If we neglect to ask how the greenhouse effect of various gases is quantified in terms of real, measurable thermodynamic properties, the idea of anthropogenic global warming may well survive long enough for us to ask how the carbon budget establishes that observed increases in CO is one of the lightest volatiles (materials of relatively low melting point), found in the mantle (Wilson, 1989).

Pictured is a ring fortress discovered on the Danish island of Zealand In their paper, published in Antiquity, the researchers wrote: 'The site offers the first chance in many years to investigate one of the most distinctive monument types of the Viking Age.'Such investigations may provide the most exciting new lines of evidence, and sustain a revised view of the Viking Age Trelleborg-type fortresses.

'Rather than static architectural and military monuments, we should instead see them as dynamic moments in the high-stakes power games of the early Middle Ages.'King Harald I, also known as Harald Bluetooth, was king of Denmark from AD 958 – 985.

After Sweyn conquered England in 1013, his son Canute ruled over a great Anglo-Scandinavian kingdom that included parts of Sweden.

A brief survey of the literature concerning volcanogenic carbon dioxide emission finds that estimates of subaerial emission totals fail to account for the diversity of volcanic emissions and are unprepared for individual outliers that dominate known volcanic emissions.

The technology was developed in the early 1960s and uses laser imaging with radar technology that can calculate distances.

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A few traces of timber constructions were also discovered by the researchers.

Mountains rise out of fold belts resulting from the crumpling of plates, and where differences in plate buoyancy allow, one plate rides over another, forcing the other plate to follow the convection current into the aesthenosphere.

Furthermore, this liquid aesthenosphere, which continues to create new crust at rifting zones such as the mid oceanic ridges, melts down subducting crust as the residue of this crust is drawn deeper into the mantle.

Ring fortresses are circular, and can measure up to 250 metres in diameter.

They are thought to have been made in an attempt to build a defensive network similar to that introduced by the Anglo Saxons, who created fortified centres at semi-regular (approximately 30km) intervals from the ninth century AD.

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