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 make Internet Explorer your default browser. Swipe in from the right edge of the screen, and then tap or click Search (if you're using a mouse, point to the upper-right corner of the screen, and move the mouse pointer down, and then click Search). Enter Default programs, and then tap or click Default Programs.