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Updated: May 14, 2025
The bulging of the crust is a necessary consequence of the absence of plication of the strata due to the extrusion of this enormous quantity of molten lava; and the intrusion of thousands of dykes over the North-east of Ireland, unaccompanied by foldings of the strata, must have added a horizontal space of several thousand feet to that region.
It has been shown in a previous page that volcanic action of recent or Tertiary times has taken place mainly along certain lines which may be traced on the surface of a map or globe. One of these lines girdles the whole globe, while others lie in certain directions more or less coincident with lines of flexure, plication or faulting.
The subject is presented in the following order: Life as an agent in protecting, destroying, and making rocks. Cohesive Attraction. The Atmosphere as a mechanical agent. Water as a mechanical agent. Heat as an agent in volcanic phenomena, igneous eruptions, metamorphism, veins, etc. Movements of the earth's crust, plication of strata, origin of mountains, earthquakes, etc. Chemistry of Rocks.
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