In its oxide or silicate form, silicon is used to make concrete, bricks, glass, ceramics, and soap. Silicon metal is also the base material for making silicones used in such products as synthetic oils, caulks and sealers, and anti-foaming agents.
Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.
Extremely rapid cooling of lava in which no crystals form results in a ____ texture. Igneous rocks formed from lava that erupted onto Earth's surface is called ___ rock. Igneous rocks that formed when magma hardened beneath the surface of Earth is called ____ rock. List the sequence in order of the processes through which sedimentary rocks form. Weather, erosion, deposition, compaction, and cementation small, solid pieces of material from rocks or living things