Full Definition of PRECEDING. See preceding defined for English-language learners. See preceding defined for kids. ADVERTISEMENT. I have had a fever of about three weeks during the last and preceding month, from which I am entirely recovered except as to strength. â 2 Thomas Jefferson, letter, 4 Sept. 1823.
This commonly happens along volcanoes. When lava comes out of the volcano, the rocks there melt, usually forming different rocks. If you are asking on the chemical basis as to why they melt, it's because rocks are formed from minerals crystals. These crystals are formed from elements, which in turn also melts (some rocks are made of carbon, and since carbon melts, rock melts too). Source(s): Gsevilla Â· 7 years ago.
Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust.xtrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface.