三、火山熔岩的某些特征结构 火山熔岩或称喷发溢流熔岩。它们是在地壳内一定深度的岩浆,沿某些裂隙上升,涌出或溢出地表而形成。火山熔岩有如下一些特征: 1.当岩浆还处于地壳深部时,部分矿物可能结晶(即后来岩石中的斑晶),随着岩浆沿通道上升过程中与围岩中某些物质反应,就影响和改选了岩浆的成分和已结晶的矿物; Third, some of the characteristics of volcanic lava volcano lava or eruption lava flow. They are magmas of a certain depth within the earth’s crust, rising along certain crevices, gushing out of or overflowing the earth’s surface. Volcanic lava has the following characteristics: 1. When the magma is still deep in the crust, some of the minerals may crystallize (ie later, the phenocrysts in the rock). As the magma reacts with certain materials in the surrounding rock as it rises along the channel And re-electing magmatic components and crystallized minerals;