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.
To set Safari as your default Windows browser, take the following steps. 1  Click on the Gear icon, located in the upper right hand corner of your browser window. 2  Safari's Preferences dialog should now be displayed, overlaying your browser window. 3  Click on the drop-down menu accompanying the Default web browser option.