Sunlight warms a river in a mountain valley. Water vapour from the river rises with the air, and tiny liquid droplets form higher above the land.
Which change must occur before the droplets form?
The liquid droplets become large enough to fall.
The river water flows downhill across the land.
The water vapour gains more energy from sunlight.
The water vapour cools as the air rises.
101 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.