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.
Sick of your default web browser? Most operating systems allow you to set what browser you want to use to open links to websites. You'll need to have your new browser installed before selecting it as the default. If you're using an iOS device, you'll need to be jailbroken in order to change the default browser. For most other operating systems, the process is fairly straightforward.