1 When Snapchat decides to IPO and sell stock to the public on a stock exchange â NYSE, Nasdaq, etc.  If somehow you knew the Snapchat team and got a chance to invest with them. I.E. you give them money directly so they can invest it back into the company and in return they give you stock.
Extrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate.
Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Most extrusive (volcanic) rocks have small crystals. Examples include basalt, rhyolite, andesite, and obsidian.