Yes. The Grand Canyon was gradual. The scablands in Washington happened through cataclysmic change. Which is why they look very different. Two very different processes.
I've been there. These are my photos of the volcano from Johnson's Ridge. It's not a canyon at all. It's a gully. Unlike the Grand Canyon, which was carved out of rock, this was soft sediment that slumps after it's cut by less than 10 meters or so. And the gully doesn't meander. Can't because only old, slow rivers meander. The sinousity index of that gully and the river into which it runs is much less than 1.5. You do find braided channels in both the gully and the river, which is typical of fast-moving streams that are often flooded.
You can look here:
earth.google.com
We can make rhyolite in labs. It's the same stuff that granite is made of, but the crystals are so small, you can't distinguish them, unless it started to harden underground first. It takes a very long time for magma to cool so that granite is formed:
The data show that it can take millions of years. Some creationists think it could be less time. Here's a creationist site with a different opinion:
Given this tabular shape, it is a simple matter to model the cooling by conduction of a 3 km sheet of granitic magma.8 Based on conduction alone (i.e. ignoring the cooling effect of fluids) it would take only 30,000 years to completely solidify from the initially liquid magma.
Creation or evolution? It makes a big difference! Over 10,000 trustworthy articles. Evidence for biblical creation.
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Thirty thousand years doen't really help creationists, but I give them kudos for their honesty. They ignored the insulation of overlying rock, which would greatly reduce the cooling. This is why lava cools rather quickly outside the earth, but takes a very long time to cool if buried underground.