True Detective Season 2 Episode 7: Black Maps and Motel Rooms. Written by Nic Pizzolatto (airs Sunday, August 2nd) Ray (Colin Farrell), Ani (Rachel McAdams) and Paul (Taylor Kitsch) take precautionary measures to elude detection and untangle a dark mystery. Frank (Vince Vaughn) deals with the fallout of his betrayal.
The permeability of the rock samples is likely to be â permeable-sandstone, chalk; impermeable â clay, slate, marble, granite. This may vary according to the samples, e.g. some sandstones may have a mixture of grain sizes and may have poor permeability.
Eventually, the volcano moves so far off the hotspot that magma is unable to be supplied; erosion takes over as the dominant geological process. This erosion is both gradual and catastrophic. Hawaiian lavas are very permeable. Many are vesicular, and lava tubes, clinker layers, and flow boundaries all provide easy pathways for percolating water. For this reason, even in many of the wettest areas of Mauna Loa and Kilauea, erosion is minimal.