Why does Cappadocia have stone towers and caves?

In the middle of Turkey, a whole valley looks like it belongs on another planet. Tall stone towers stand like skinny giants wearing pointy hats. Hillsides are carved with hundreds of windows and doorways, like someone took a cookie cutter to the rock itself. This is Cappadocia, and the stone towers aren't buildings — they're what's left after millions of years of wind and rain carved the landscape. The caves aren't natural hiding spots — people cut them, room by room, into the soft rock.
The story starts with volcanoes. Millions of years ago, three volcanoes near Cappadocia erupted over and over, covering the valley in layers of ash. The ash piled up hundreds of feet thick and then did something unusual — it pressed together into a soft rock called tuff. Tuff is weird: hard enough to stand in tall formations, but soft enough that you can carve it with simple metal tools, almost like cutting into cold butter.
