WebThe differences are in their grain sizes and their rates of cooling. Diorite crystallized slowly within the Earth. That slow cooling produced a coarse grain size. Andesite forms when a similar magma crystallizes quickly at … WebDacite has a wide range of physical characteristics. Some of these include: –Color: Dacite can be gray, white, pink, or even black. –Texture: Dacite is typically fine-grained, but it …

Andesite rock Britannica

Webigneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth material. Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary. Igneous rocks are formed from the solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) … WebLavas of andesitic or intermediate composition commonly form a somewhat different type of flow, known as a block lava flow. These resemble aa in having tops consisting largely of … gertley mechanical peterborough

Pumice Properties, Composition, Formation, Uses - Geology …

WebWhich one of the following best characterizes the asthenosphere? Select one: a. a zone of softened peridotite in the upper mantle b. a layer of soft, solid, magnesium silicates and molten iron droplets at the base of the mantle c. a zone of hardened, silicate rock at the base of the oceanic crust WebAndesite is a fine crystalline intermediate extrusive rock. It is commonly grey and porphyritic. It can be found in the Andes Mountains and in some island arcs (see Chapter … WebMar 7, 2024 · lava, magma (molten rock) emerging as a liquid onto Earth’s surface. The term lava is also used for the solidified rock formed by the cooling of a molten lava flow. The temperatures of molten lava range from about 700 to 1,200 °C (1,300 to 2,200 °F). The material can be very fluid, flowing almost like syrup, or it can be extremely stiff, scarcely … gertler \\u0026 wente architects llp