WebOct 28, 2024 · Extrusive rock is one of two types of igneous rock, the other type being intrusive igneous rock. One key characteristic that geologists use to determine if a rock is … WebFeb 8, 2024 · Extrusive rocks have a fine-grained or glassy texture. Basalt is a fine-grained extrusive rock. It consists of crystals too small to be seen without a microscope. Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has the smooth, shiny texture of a thick piece of glass.
Which Of The Following Is True About Intrusive Rocks - QnA
WebMar 7, 2024 · Volcanic and Extrusive Igneous Rocks Andesite. Andesite is more siliceous and less fluid than basalt. The large, light phenocrysts are potassium feldspar. Rhyolite. Rhyolite is a high-silica rock, the extrusive … Webinto three types depending on what minerals they contain and how they are formed. The three types of rock are: igneous. metamorphic. sedimentary. Look through the slideshow to find out more about ... black widow brass trimmer
Igneous rock Characteristics, Examples, Formation, & Types
WebApr 13, 2024 · The most obvious difference between extrusive rocks and intrusive rocks is crystal size. Because extrusive rocks cool quickly, they only have time to form very small crystals such as basalt or none at all. … WebDec 1, 2024 · Felsic extrusive igneous rocks (e.g., rhyolite) are usually light in color (though obsidian is a notable exception; see below) because they are rich in minerals like feldspar that contain a lot of Al, Na, or K. Mafic extrusive igneous rocks (e.g., basalt) are darker in color, again reflecting the compositions of the minerals present, which tend to be rich in … WebApr 5, 2024 · 1. Classify igneous rocks into two main types: intrusive or extrusive. Each of these types of rocks will have specific properties that will help you distinguish which type your igneous rock is. [2] Magma is molten rock that flows beneath the earth's surface. Igneous rocks are formed by cooling magma. fox speaker box