Igneous-rock sentence example
- The system is without any notable amount of igneous rock.
- The northern coast range is formed by the oldest rocks in the island, consisting chiefly of limestones and marbles with occasional masses of igneous rock.
- emplacement of magma and its solidification to igneous rock known locally as greenstones) also occurred.
- The first mode of occurrence is of little significance practically, for the crystalline rocks generally contain too little phosphate to be valuable, though occasionally an igneous rock may contain enough apatite to form an inferior fertilizing agent, e.g.
- They are generally of lenticular form, and usually occur in or near the contact of eruptive rocks with schists or slates; the presence of the igneous rock being probably connected genetically with their origin.Advertisement
- Most interesting among these are the Henry Mountains, formed by the intrusion of molten igneous rock between the layers of sediments, causing the overlying layers to arch up into dome mountains.
- Stream erosion has dissected these domes far enough to reveal the core of the igneous rock and to give a rugged topography.
- or S.E.; in this band of weak rocks were several sheets of hard igneous rock (trap) inclined from the horizontal several degrees, and so resistant that they were not removed but remained to form the " trap ridges " such as West Rock Ridge near New Haven and the Hanging Hills of Meriden.
- These clays are produced by the decomposition of the granite by acid vapours, which are discharged after the igneous rock has solidified ("fumarole or pneumatolytic action").
- F. Magma is intruded into older rocks and crystallizes into a pink igneous rock called granophyre.Advertisement
- mafic igneous rock consisting of plagioclase feldspar and pyroxene.
- Granite: An igneous rock forming much of the cairngorm mountains and other hills in Scotland.
- Orbicular granite - this igneous rock has an unusual orbicular granite - this igneous rock has an unusual orbicular structure that is sometimes seen in granites and diorites.
- Granite is a lighter colored igneous rock containing relatively large crystals of the minerals plagioclase, quartz and alkali feldspars such as orthoclase.
- When this is slow you get bigger igneous rock crystals from magma.Advertisement
- True granite is an igneous rock made up of mica, feldspar and quartz.
- Practically all the remaining area in these islands is occupied by metamorphic schists and gneisses which occur in great variety and with which are associated numerous dikes and masses of intrusive igneous rock.
- See also cut-off grade Gabbro A coarse grained igneous rock consisting of calcic feldspar, pyroxene and commonly hornblende and/or olivine: appx.