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.
Rating Newest Oldest. Best Answer: It depends on the rock, but typically about 600 C (1100 F) to 1200 C (2200 F). Quartz or quartz rich rocks have the lowest melting point, and basaltic rocks have the highest melting points. So at 1500 F, it is difficult to tell.Quartz can become explosive, but this occurs at much higher temperatures and pressures, such as in volcanic episodes.ating Newest Oldest. Best Answer: It depends on the rock, but typically about 600 C (1100 F) to 1200 C (2200 F). Quartz or quartz rich rocks have the lowest melting point, and basaltic rocks have the highest melting points. So at 1500 F, it is difficult to tell.