| 1. | Deformational events are often also associated with volcanism and igneous activity.
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| 2. | Zonation patterns associated with igneous activity are usually easy to interpret.
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| 3. | The Waziristan hills were subject to igneous activity during the late Cretaceous period.
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| 4. | Laccolith formations are caused by igneous activity otherwise known as melting within the earth.
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| 5. | Igneous activity associated with this stretching occurred from 12 million to 4 million years ago.
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| 6. | The igneous suite marks the last phase of igneous activity of Precambrian age in the Indian subcontinent.
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| 7. | Hydration of minerals occurs generally in concert with hydrothermal circulation which may be driven by tectonic or igneous activity.
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| 8. | During the early part of the era, considerable igneous activity took place in neighboring states to the east.
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| 9. | Many of the grabens have prominent signs of igneous activity, with diabase intrusions and basalt flows being quite common.
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| 10. | Igneous activity continued throughout the Cenozoic but was particularly more active in the northern region of Borneo in the Neogene.
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