Physical geography. Artwork showing some of the many natural processes occurring on Earth, in the sea, on the land, and in the air. The processes are fuelled by energy from the Sun (upper left) and from within the Earth (orange arrows, lower left). Other arrows show various transport processes and natural cycles. Rivers flow from mountains (left) to the coast (centre), forming flood plains and coastal deltas (one at centre right) from sediment carried downstream. Clouds form over mountains (upper left), depositing water evaporated from the sea. Underwater volcanoes (lower right) rise to form volcanic islands (upper right). Winds and ocean currents (coloured arrows) circulate heat through the atmosphere and oceans.