alien
beautiful
beauty
bottom
bright
canyon
clay
colorful
deposits
desert
environment
erosion
extraterrestrial
fragment
gorge
gravel
iron
lake
landscape
lifeless
mars
martian
minerals
mining
nobody
nonpotable
pit
poisonous
produced
red
reflection
ripple
salts
sand
silence
slopes
symmetry
unearthly
unusual
water
waves
weathering