Recent questions tagged earth-quiz

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Which tabular, discordant igneous rock body intrudes along a crack or fissure?

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Which kind of volcano is closely associated with convergent plate boundaries and subduction zones?

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Another term for a volcanic mudflow is a ________.

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What kind of volcanoes are Kilauea and the other big Hawaiian volcanoes?

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Pyroclastic fragments intermediate in size between ash and bombs are known as ________.

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A relatively small, summit depression on a volcano, marking a former eruptive vent, is a ________.

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________ is a dangerous, fast moving, hot, turbulent cloud of volcanic gases and fine-sized, pyroclastic particles.

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________ denotes a basaltic lava flow covered with angular, congealed lava rubble.

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What term describes fragmental volcanic material?

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Which basaltic lava flow has a relatively smooth surface?

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Large, volcanic depressions formed by subsidence and collapse are known as ________.

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Vents that emit only hot gases and vapors are called ________.

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________ is the most abundant gaseous component dissolved in most magmas.

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Composite volcanic cones are also known as ________.

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Basalt is the most common magma erupted along oceanic rift systems.

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Aa flows are generally thinner and have smoother surfaces than pahoehoe flows.

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Vents that emit only heated, volcanic gases and water are called fumaroles.

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Crater Lake in Oregon actually occupies a caldera, not a crater.

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In general, cinder cones are much larger than shield volcanoes.

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Repeated eruptions of relatively fluid lava from fissures can eventually cause an area to be covered by flood basalts.

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Small amounts of water can lower partial melting temperatures in silicate rocks.

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Basaltic lavas are generally hotter and more viscous than andesite lavas.

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Most basaltic magmas are believed to form by partial melting of granite in the lower crust and upper mantle.

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The active Hawaiian volcanoes are situated directly above a major boundary between two of the Earth's largest tectonic

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Magma generation at depth almost always involves partial melting, not complete melting of the source rock.

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