Igneous rocks are formed deep inside Earth's crust (intrusive rocks) or at the surface (extrusive rocks). As molten rock (known as magma) below the surface cools, the liquid material begins to solidify into minerals of differing sizes and compositions. Generally, the longer the cooling time, the larger the mineral crystals can grow.
Rhyolititcen rocks.
Igneous rocks are formed by the solidification of molten materials.
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
No, igneous rocks are harder than sedimentary rocks on average.
extrusive igneous rocks =/
cool
David R. M. Pattison has written: 'The Ballachulish Igneous Complex and aureole' -- subject(s): Description and travel, Igneous Rocks, Intrusions (Geology), Rocks, Igneous
igneous rocks
Rhyolititcen rocks.
Igneous rocks are formed by the solidification of molten materials.
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
Igneous rocks
Yes. Volcanic rocks are extrusive igneous rocks.
No, igneous rocks are harder than sedimentary rocks on average.
Dougal Jerram has written: 'Introducing volcanology' -- subject(s): Volcanology, Popular works, Volcanoes 'The field description of igneous rocks' -- subject(s): Igneous rocks, Fieldwork, Identification, Geology
extrusive igneous rocks =/
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.