间歇泉白板动画

Hand-drawn cross-section of the ground showing how a geyser works: the top strip is the ground surface with a little grass, and below it brown and grey rock layers. Deep at the bottom, a glowing red-orange pocket of hot rock (magma). One narrow, twisting vertical crack runs from just above the hot rock up to the surface, filled with blue water. At the surface, a tall white column of water and steam shoots straight up out of the crack into the sky. Only these things: rock layers, hot rock, the water-filled crack and the eruption. Nothing else in the picture, plenty of empty sky. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.