While the lava slowly cooled and hardened, the North American Continental Plate collided with other plates and squeezed the lava flow from its sides.
(the lava; slowly cooled; ) (the lava; hardened; ) (the North American Continental Plate; collided; with other plates) (the North American Continental Plate; squeezed; the lava flow from its sides; T:While the lava slowly cooled and hardened)
the lava the lava the North American Continental Plate the North American Continental Plate
slowly cooled hardened collided squeezed
with other plates
the lava flow from its sides T:While the lava slowly cooled and hardened