What are the keywords in the following sentence? these trees grow out of rocks in a forest
forest, grow, rock

What are the keywords in the following sentence? An abandoned train with a tree growing on it by a building.
abandon, building, train

What are the keywords in the following sentence? young women having fun while smiling and sending love to the camera in the park in slow motion
fun, motion, park

What are the keywords in the following sentence? old trees with large and deep roots covered with moss in a deep forest
cover, moss, root, tree