16. 1 Water circulates through the hydrologic cycle (水文循环) The Earth's water is constantly circulating powered by the heat of the sun and the force of gravity Water evaporated from ocean precipitates(降水) into the ocean direct route Water evaporated from ocean is blown by winds until it is over the land and precipitates:(1 evaporates beck into atmosphere, (2). Infiltrate the ground, (3 ). Become part of the snow or glacier,(4). Drain to a river and back to the sea16.1 Water circulates through the hydrologic cycle （水文循环） • The Earth’s water is constantly circulating, powered by the heat of the sun and the force of gravity. • Water evaporated from ocean precipitates (降水) into the ocean: direct route. • Water evaporated from ocean is blown by winds until it is over the land and precipitates: (1) evaporates beck into atmosphere, (2). Infiltrate the ground, (3). Become part of the snow or glacier, (4). Drain to a river and back to the sea