Concepts: flow, river, valley, waterfall
A: waterfalls flow into river in a deep valley surrounded by mountains
Concepts: load, passenger, train
A: Passengers are preparing to load onto a train.
Concepts: rail, smoke, train
A: A train that is on the rails with smoke coming out of it.
Concepts: compete, competition, snowboarder
A:
Snowboarder competing in jump competition.