petrology /petˈrɒləʤi/ petrología: They went on a visit to the university's petrology department.

bedrock lecho de roca, roca sólida: A stable soil soaks up water, and allows acid to break up bedrock and create more soil.

rock formation /rɒk fɔːˈmeɪʃən/ formación rocosa: We discovered an astonishing rock formation.

rock slide desprendimiento de rocas: A rock slide temporarily closed Highway 141.

rockery / rock garden (jardín de) rocalla: Does this plant grow well in a rockery?

IDIOMS

as solid as a rock sólido,-da como una roca, fuerte, fiable: Their marriage has remained as solid as a rock.

as steady as a rock sólido,-da como una roca, tranquilo,-la, en calma: His heart, which was normally as steady as a rock, still pounded uncomfortably a minute later.

be caught between a rock and a hard place llevar las de perder, estar entre la espada y la pared: He was caught between a rock and a hard place. He hated the job, but if he left, he might not be able to find another soon enough.

hit/reach rock bottom tocar fondo: Eventually, his popularity hit rock bottom.

on the rocks 1. en crisis, en una situación precaria: The idea of early elections is now on the rocks. ^ Their marriage was on the rocks. 2. con hielo [a drink]: He ordered a bourbon on the rocks.