Tuff Up
Tuff Up - the up side
Red hot ash from a volcano, falls from the sky and welds together to form thick layers of rock.We can determine which way is "up" in the ash by looking at any curved fragments in the ash layers.
If you drop a saucer into water - the curved surface will always point downwards.
Similarly ash fragments will orient curved side downwards
Space craft returning to earth enter the atmosphere curved side downwards as this is the most stable confiruration
Learn more about VOLCANOES