volcanic rock
5
3.6
- noun
- /vɑlˈkænɪk rɑk/
- Specialized
- The island of Rapa Nui was formed from volcanic rock millions of years ago.
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Watch on YouTubeWell, perlite is an expanded volcanic rock that is really, really lightweight.
- Well, perlite is an expanded volcanic rock that is really, really lightweight.
- There's a lot of volcanic rock and this rock actually is buildable material as well.
- It has this little like volcanic rock that you can clean.
- I was at Johnson Space Center produced that it's it's probably just pulverized volcanic rock, but it does.
Examples
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In truth, the effect is caused by gas escaping from volcanic rocks on the sea floor.
Blog text (7) -
It's actually a volcanic rock that's been expanded and it crushes very easily.
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Now volcanic rocks in particular form like this one here, this is a volcanic rock.
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We are looking at a steep cliff face composed of black volcanic rock.
Fiction book (1993) -
The structure was embedded partially in ice and volcanic rock, which helped to preserve it.
Blog text (24) -
There's a lot of volcanic rock and this rock actually is buildable material as well.
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The porous volcanic rock results in a lack of perennial streams, but springs are present on the lower slopes of the volcanoes.
Academic text (2004) -
You've got these volcanic rock formations where there's all these crevasses, crevasse and tunnels.
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Although forever marked with patches of sun-struck sagebrush and dark outcroppings of volcanic rock, Ravensfield Valley in June was as green and glorious as it would ever be.
Fiction book (1993) -
Iceland, which is itself a mass of volcanic rock erupted from the submarine meeting point of the North American and Eurasian tectonic plates, was effectively split apart.
Academic text (2010)
Synonyms
7
7.2
A dark, heavy rock made when lava cools
7
7.9
A hard dark rock made when lava cools quickly and becomes like glass with a smooth shiny surface
1
6.7
A hard shiny rock made when hot lava cools and hardens very fast
1
9.9
A light-coloured volcanic rock made when thick lava cools quickly and forms tiny crystals
1
9.9
A grey volcanic rock with many small crystals
1
9.9
A dark volcanic rock made from lava near volcanoes
1
7.0
Lava that hardens into rounded, pillow-like masses after erupting under the sea
A dark, glassy volcanic rock that forms when hot lava cools very fast
A rock made from volcanic ash and small pieces of lava used for building
How Plutonic
- Specialized
- Specialized
5
3.6
Surface Forms
Morphology
The meaning is directly and compositionally derived from 'volcanic' (related to volcanoes, lava or ash) + 'rock' (natural solid mineral material), so a learner who knows both words can infer it refers to rock formed by volcanic activity. This is a common, cross-linguistically consistent noun phrase following standard English adjective + noun composition, making it immediately comprehensible to B1 learners.
Etymology
Volcanic rock comes from a simple picture: when a volcano erupts, very hot melted rock called lava cools and hardens into solid rock, so the word volcanic, meaning 'from a volcano', plus rock describes that stone. That's why 'volcanic rock' means 'rock made from lava'.