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61. Instead, the basalt flows and volcanic central peaks are found to be very closely associated with large craters.

62. Perlite: A volcanic material like vermiculite and with many of the same properties. When dry it is easily blown around.

63. So volcanic rocks are composed of only a few mineral groups, each group having its own characteristic atomic structure.

64. Volcanic rocks cool quickly, trap the argon, and so give good dates.

65. The buried artifacts were found between layers of volcanic ash and other substances.

66. In one dip in the mountains, where the sun has just sunk, there is a red volcanic brilliance.

67. The important properties of these three principal volcanic rock groups can be summarized in simple tables.

68. The characteristics of the various types of volcanic eruption are considered in the general texts mentioned above.

69. Volcanicity and magma emplacement, largely in the form of large granite intrusions, characterize the volcanic arc.

70. El Golfo An unusual, vividly green lagoon, separated from the sea by a beach of black volcanic sand.

71. The Banda archipelago is volcanic and luxuriously tropical, perfect for snorkelling and diving.

72. Most volcanic rocks contain some phenocrysts - they are a bit like the pips in raspberry jam.

73. We're talking about the combined and simultaneous effect of a massive thermonuclear detonation, a volcanic eruption and an earthquake.

74. Then I remembered the room of the sirocco in a Sicilian palace made of pink volcanic sugar.

75. More majestic, in central North Island, was a flight over volcanic territory.

76. These are frequently associated with volcanic rocks of oceanic type.

77. Basalts are examples of basic volcanic rocks(sentencedict.com), while andesites are intermediate between basic and acid.

78. Convergent boundaries between oceanic lithosphere are marked by an oceanic trench, a volcanic island arc and a Wadati-Benioff zone.

79. It turned out that that impact was not limited to volcanic eruptions.

80. It is commonly said that tsunamis are usually triggered by earthquakes or violent volcanic explosions.

81. RioFinex examined the Ordovician volcanic rocks of County Tyrone for base metals but found only minor intersections of low-grade copper mineralisation.

82. The dizzying heights and plummeting depths of the volcanic mountains have their social parallels in this deeply divided country.

83. But it has endured because it was constructed of brick and volcanic rock between 1783 and 1792.

84. We saw dead volcanic lakes, grey under the grey sky.

85. Was there a volcanic pimple on the end of my nose?

86. The complexity of some volcanic eruptions is illustrated by the detailed observations made of Mount St Helens in 1980.

87. Solids can release gases back into the atmosphere when heated and pressed by volcanic activity.

88. Perlite: A volcanic material like vermiculite and with many of the same properties.

89. Major volcanic eruptions also project significant quantities of tephra into the earth's upper atmosphere(sentencedict.com/volcanic.html), with global effects.

90. There was no shortage of excellent building materials from varied marbles to stone, brick and volcanic substances.