adventure
adversity
avakas
background
blockage
boulder
canyon
caution
cliff
clod
clump
danger
dean
deep
difficult
discovery
down
earthquake
element
eroded
fall
flat
geology
hunk
icon
landscape
layer
lump
mountain
natural
nature
notch
obstruction
outdoor
ravine
ridge
road
rock
rockfall
scenic
sign
stone
symbol
traffic
travel
tumble
valley
wall