Mountains with trees loom high in the background.
The volcano masks itself under the disguise of a mountain.
Mountains aren't always a volcano.
exists e1 p1 x1 x2 x3.(n_background(x3) & in(e1,x3) & exists s1.(Theme(s1,x1) & a_high(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_loom(e1) & with(x1,x2) & n_tree(x2) & n_mountain(x1))
exists e1 x1 x2 x3.(n_disguise(x3) & n_volcano(x1) & under(e1,x3) & of(x3,x2) & n_mountain(x2) & Theme(e1,x2) & Actor(e1,x1) & v_mask(e1) & n_thing(x2))