Hard as rock, tough as nails

The most common sedimentary rocks are chalk, limestone, sandstone, clay and shale.

If you heat up sedimentary rock and apply great pressure you get new rocks like granite and marble.

But why don't we got new igneous (granite) and metamorphic (marble) rocks any place?

When was the last time you heard someone say "Hey, look at the new marble!" or "That will be great looking granite when it cools!"

And why does the "size" of a nail get larger as the nail gets larger, but the "size" of wire gets larger as the wire gets smaller.