"ناسا" تكشف صورا جديدة لأشجار على سطح "الم&
 

The "trees" are really trails of debris caused by landslides as ice melts in Mars's spring. You can even see a cloud of dust, just to the left of centre of the picture, where an avalanche is caught happening.

[...] NASA's Candy Hansen told The Sun: "The streaks are sand, dislodged as ice evaporates, which slide down the dune. At this time of the Martian year the whole scene is covered by CO2 frost."

Source

la2 ya albe no trees :p