sentences: if land expands in a atmosphere in a rock, then the stone will fix apart
docs: digging_hole is moving_earth. stone is small_rock. earth has shape_of_sphere igneous_rock is stone. many_rocks has oxygen_locked_inside stone is solid_rocky_planetary_stuff. rock is stone. slate is metamorphic_rock. stones is rocks_with_smooth_edges. metamorphic_rock is stone.