Three decades ago, the first edition of Physical Geology by Plummer and McGeary was published. Twenty years later, Diane Carlson became a coauthor as David McGeary phased into retirement. Now, after ten more years, Lisa Hammersley joins the team for this, the 13th edition. As you may see from the brief biography at the end of this preface, Dr. Hammersley expands the diversity and expertise of the team of authors. The three authors were born and raised in Mexico (Plummer), northern Wisconsin (Carlson) and England (Hammersley). They have worked in geology in Alaska, Antarctica, Washington Cascades mountains, northeastern Washington, Idaho, Utah, Montana, on Ice Island T-3 in the Arctic Ocean, Mexico, the Andes (Peru and Ecuador), and California’s Sierra Nevada. <...>