Energy Moves Water - Middle School Earth and Space Science
- Which option correctly matches the driver: evaporation or runoff?
- Evaporation: Sun; Runoff: gravity. Sun provides heat for evaporation; gravity pulls water downslope.
- What is the name for the area of land where all runoff drains to the same stream or river?
- Watershed (drainage basin). All precipitation in this area flows to one water body.
- What is infiltration in a soil-and-water model?
- Water soaking into the ground from the surface. Porous soil allows water to move downward through spaces.
- What is the process of infiltrated water moving downward through soil and rock due to gravity?
- Percolation. Gravity pulls infiltrated water deeper through soil layers.
- Which option correctly identifies the two main drivers of water movement in the water cycle?
- Solar energy and gravity. Sun powers evaporation; gravity drives precipitation and runoff.
- Identify the correct label for a model arrow from atmosphere to plant leaves: transpiration or precipitation?
- Precipitation. Water falls onto plants from above, not released from leaves.
- What is an aquifer in a groundwater model?
- Permeable rock or sediment that stores and transmits water. Porous rock/sediment allows water storage and movement.
- Which model component represents gravity-driven movement of groundwater from high to low elevation?
- Groundwater flow toward lower hydraulic head. Gravity causes water to flow from high to low pressure areas.
- What process turns water vapor into liquid droplets when air cools?
- Condensation. Water vapor loses energy and forms liquid droplets when cooled.
- Identify the model arrow direction for runoff on a sloped surface: uphill or downhill?
- Downhill. Gravity always pulls water toward lower elevations.
- What phase change forms cloud droplets when water vapor cools and becomes liquid?
- Condensation. Cooling causes water vapor molecules to bond together as liquid droplets.
- What is the term for water that flows over land into streams and rivers after precipitation?
- Surface runoff. Gravity pulls water across land surfaces toward lower elevations.
- What is the boundary between the zone of aeration and the zone of saturation called?
- Water table. Marks the top of the saturated zone underground.
- What is the process called when plants release water vapor to the atmosphere?
- Transpiration. Plants absorb water through roots and release it through leaf pores.
- What is the process of water soaking into the ground from the surface?
- Infiltration. Water enters soil through pore spaces and cracks.
- Which process should be labeled on a model arrow from ocean surface to atmosphere: evaporation or precipitation?
- Evaporation. Water moves from ocean to air as vapor, not liquid drops.
- Which model label should be placed where water changes from vapor to liquid in the atmosphere?
- Condensation. This phase change occurs when water vapor cools in the atmosphere.
- What is the underground zone where all pores and cracks are completely filled with water?
- Zone of saturation. Below this depth, all available spaces contain water.
- What is the role of the Sun in moving water from oceans and lakes into the atmosphere?
- Heats water to cause evaporation. Solar radiation provides the energy needed for phase change.
- What phase change occurs when liquid water absorbs solar energy and becomes water vapor?
- Evaporation. Solar heat energy breaks bonds between water molecules, creating vapor.
- What term names the combined movement of water to the air by evaporation and transpiration?
- Evapotranspiration. Combines water loss from soil evaporation and plant transpiration.
- What is runoff in a watershed model?
- Water flowing over land into streams, rivers, lakes, or oceans. Gravity drives surface water flow toward lower elevations.
- Identify the correct direction of water movement caused by gravity in a slope model.
- From higher elevation to lower elevation. Gravity always pulls water downward along slopes.
- What process releases water vapor from plant leaves into the atmosphere?
- Transpiration. Plants release water vapor through stomata as part of photosynthesis.
- What is the single term for evaporation plus transpiration in Earth system models?
- Evapotranspiration. Combines water loss from soil/water surfaces and plant leaves.
- What is the primary energy source that drives evaporation in the water cycle?
- Solar energy from the Sun. Heat from the Sun provides energy to convert liquid water to vapor.
- Which statement matches a correct model: Sun drives evaporation, or gravity drives evaporation?
- Sun drives evaporation. Solar energy provides heat needed for water to vaporize.
- What force pulls water downhill and drives runoff and streamflow?
- Gravity. This downward force causes water to flow from high to low elevations.
- Which option best describes why water vapor rises after evaporation in a model?
- Warm, less dense air rises carrying water vapor. Heated air expands, becomes less dense, and rises with vapor.
- What process changes liquid water at Earth's surface into water vapor using solar energy?
- Evaporation. Solar heat provides energy for water molecules to escape as vapor.
- Which statement matches a correct model: gravity drives downhill flow, or Sun drives downhill flow?
- Gravity drives downhill flow. Gravity, not solar energy, pulls water downward.
- In a watershed model, where does water flow at the boundary ridge line between two basins?
- It flows to opposite sides into different basins. Ridge lines divide watersheds; water flows away on each side.
- Identify the correct sequence for a basic water cycle model starting with surface water.
- Evaporation → condensation → precipitation → runoff. Shows water moving from surface to air to clouds to ground.
- What force pulls water downhill as runoff and moves groundwater toward lower elevations?
- Gravity. Earth's gravitational pull moves water from higher to lower elevations.
- What is the role of gravity in moving water from clouds back to Earth's surface?
- Pulls precipitation downward. Gravity's downward force moves water from atmosphere to surface.
- What is groundwater flow?
- Movement of water through saturated ground due to gravity. Gravity pulls water through connected pore spaces underground.
- Which process should be labeled on a model arrow from cloud to ground: condensation or precipitation?
- Precipitation. Water falls from clouds as rain/snow, not just forms droplets.
- What is the main source of energy that powers evaporation in the water cycle?
- Solar energy from the Sun. Heat from the Sun provides energy to change liquid water to vapor.
- What is the term for water falling from clouds to the ground as rain, snow, sleet, or hail?
- Precipitation. Gravity pulls water droplets/ice crystals from clouds to Earth.