Assertion: lava's surface | /r/HasProperty | difficult to walk
Facets:
value: much more
type: DEGREE
Source sentences:
text: After cooling, the surface became more jagged and was much more difficult to walk on, and the flow surface turned from black to grey.
text: AA LAVA Unlike smooth-skinned pahoehoe lava, aa lava has a rough surface, which is difficult to walk on and sharp enough to rip rubber shoes.