Posted by Mary Claire on Monday, February 16, 2009 at 5:27pm.
I would guess that basalt was harder than granite and sandstone would wash away first, but I am no geologist.
I would guess it's granite for the most resistant and sandstone for the least resistant.
Also please note the typing error: it is GNEISS
Actually, now that I think of it, sandstone is also resistant to weathering, thus the least resistant would probably be LIMESTONE.
So, my guess is GRANITE for the most resistant and LIMESTONE for the least resistant.
(If I remember correctly, sandstone consists mostly of fine-grained quartz and quartz is highly resistant to weathering. Limestone consists of calcite.)
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