A dyke (or dike) in geology is a type of later vertical rock between older layers of rock. Technically, it is any geologic body which cuts across:1  flat wall rock structures, such as bedding. dyke (or dike) in geology is a type of later vertical rock between older layers of rock. Technically, it is any geologic body which cuts across: 1  flat wall rock structures, such as bedding.
Another example would be the âdefault browserâ on your computer. Windows PCs come with Internet Explorer (the blue âEâ icon) as the default browser, just as Apple includes their own Safari browser as the default on their Mac computers.
This tutorial was last updated on March 17, 2015 and is only intended for desktop/laptop users running the Mac OS X 10.10.x (or above) operating system. While Apple's Safari is a well-known favorite among Mac users, OS X's default browser is far from the only game in town. With popular alternatives such as Chrome and Firefox available on the platform, along with other formidable options like Maxthon and Opera, it not uncommon to have several browsers installed on the same system.