DIFFERENTIAL WEATHERING & EROSION
Differential weathering and differential erosion are often, jokingly, the default explanations for odd-looking rocks or geologic scenery. But they are important, real-life processes. Differential weathering and differential erosion refer to hard, resistant rocks & minerals weathering and eroding more slowly that softer, less-resistant rocks & minerals.
The rock shown below is an intrusive igneous rock (gabbro?) with two intersecting granite dikes. The dikes noticeably project from the rock surface. The dark host rock has weathered & eroded at a faster rate than the granite dikes.
Differential weathering and erosion on a dark-colored intrusive igneous rock (gabbro?) having intersecting, pinkish-colored granite dikes that project from the rock surface (public display, Field Museum of Natural History, Chicago, Illinois, USA).