12 Questions
What is the term used to describe molten rock material that reaches the Earth's surface?
Lava
Which process results in the slow cooling and solidification of molten rock material injected into the Earth's crust?
Igneous intrusion
What do the solidified lavas and intrusions collectively form?
Igneous rock
Which element is a basic component of silicate minerals?
Silica
What causes a magma to solidify as a rock-glass without crystals?
Fast cooling
What was the original term used for rocks containing high amounts of silica?
'Salts' of silicic acids
What type of magmas are less viscous than acid magmas?
Basic magmas
What is the estimated total area covered by basalt flows worldwide?
2.5 million km2
What term is used to describe dissected volcanic cones of central eruptions that were active in past geological ages?
Fossil volcanoes
What volcanic feature is characterized by large flat cones formed by successive flows of basaltic lava?
Shield volcano
What type of eruption is described as 'paroxysmal' due to the large gas content in the lavas?
'Central' eruption
'Nuees ardentes' refer to:
'Glowing clouds'
Test your knowledge on geology basics related to lava, igneous intrusion, and igneous rock formation processes. Explore how molten rock material reaches the Earth's surface, the creation of various intrusions within the crust, and the formation of solidified rocks from lava and intrusions.
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