metamorphosed, faulted, foliated, and folded. Even older rocks, such as the Acasta gneiss of the Slave craton in northwestern Canada, the oldest known rock in...
87 KB (9,655 words) - 22:30, 8 August 2024
The presence of liquid water is evidenced by certain highly deformed gneisses produced by metamorphism of sedimentary protoliths. The moderate temperatures...
40 KB (4,104 words) - 19:36, 7 August 2024