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.
How to Make Safari Your Default Browser. If you have multiple Web browsers installed on your computer, you will need to specify which one you want to use as your default Web browser. Since Safari is Apple's newest and most sophisticated Web browser, Macintosh users will often choose to download Safari and make it their default Web browser.