The Principle of Cross-Cutting Relationships. Sometimes magma pushes, or intrudes, into cracks in existing rocks. When the melted rock cools and solidifies, the resulting feature is called an igneous intrusion. This image shows metamorphic rock in Death Valley, California, cut by a darker igneous intrusion.
ISO stands for International Standards Organisation and it refers to the industry norm for sensitivity of emulsion based film, with 100 ISO being not so sensitive (and the standard ISO used by most people) to 1600 ISO which is extremely sensitive to light.
An ISO file, often called an ISO image, is a single file that's a perfect representation of an entire CD, DVD, or BD. The entire contents of a disc can be precisely duplicated in a single ISO file. Think of an ISO file like a box that holds all the parts to something that needs built - like a child's toy you might buy that requires assembly.