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Volcanic rocks (often
shortened to
volcanics in
scientific contexts) are
rocks formed from lava
erupted from a volcano. Like all rock types, the concept...
- 232thorium, and
their decay products, and 40pot****ium.
Solidified and
effusive rocks such as granite, tuff, and
pumice have
higher levels of radioactivity...
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consisting of m****ive
effusive rocks made up of
basaltic sheets separated by
volcanic ashes and tuffs,
mixed with
terrigenous rocks with
layers of coal...
- fragments. A
tuffite consists of
angular and/or
rounded fragments of
effusive rocks and
their minerals, also may
contain volcanic ash,
pumice and clay minerals...
- 133°0′0″E / 50.00000°N 133.00000°E / 50.00000; 133.00000
Geology Orogeny Alpine orogeny Type of rock Granite, gneiss,
sedimentary and
effusive rocks...
- also
often called lava. A lava flow is an
outpouring of lava
during an
effusive eruption. (An
explosive eruption, by contrast,
produces a
mixture of volcanic...
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characterized as
either explosive eruptions,
sudden ejections of rock and ash, or
effusive eruptions,
relatively gentle outpourings of lava. A
separate list is given...
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about 80 km (50 mi). The only
rocks that do not seem to be
related to the
caldera are
scattered ****s and
small effusive flows of the
Taylor Brook rhyolites...
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rhyolitic magma extremely viscous. This
favors explosive eruptions over
effusive eruptions, so this type of
magma is more
often erupted as
pyroclastic rock...
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increased pressure restricts the
release of
volatile gases and
results in
effusive eruptions. It has been
estimated that at
depths greater than 500 metres...
