"the rover team found igneous rock, which can form deep underground from magma or from volcanic activity at the surface. Igneous rocks are excellent record-keepers, particularly because mineral crystals within them preserve details about the precise moment they formed. In this case, they preserved an astonishingly complex record of water activity on early Mars. In fact, these rocks showed signs of having interacted with water on at least three separate occasions, with each encounter further altering their chemistry and appearance."
[OP] Doug19 | 6 hours ago
"the rover team found igneous rock, which can form deep underground from magma or from volcanic activity at the surface. Igneous rocks are excellent record-keepers, particularly because mineral crystals within them preserve details about the precise moment they formed. In this case, they preserved an astonishingly complex record of water activity on early Mars. In fact, these rocks showed signs of having interacted with water on at least three separate occasions, with each encounter further altering their chemistry and appearance."
Nathan-Stubblefield | an hour ago
Canals!