A wood relief is a carved picture made of wood. It can be "bas relief" in which case there are no 'undercuts' or "haut relief" in which case there are undercuts and holes.

Oversteepened slopes are first formed when a stream undercuts a valley wall or waves pound against the base of a cliff.

It depends on your file system. Some filesystems are CASE sensitive but typically JPG and jpg are the same thing.

* matches anything. *.jpg would mean any file with a .jpg extension. 1*.jpg would mean any file where the name begins with 1 and ends with a .jpg ? matches any single character. ?.jpg would match a.jpg, 1.jpg, or F.jpg but not a1.jpg. Several ? wildcards can be used so that ??.jpg would match any jpg file with a two letter name.

A good program to convert jpg to pdf would be the JPG to PDF Converter. You can download it off of www.go2pdf.com/jpg-to-pdf.html, by clicking on the link.