The water cycle

9.Which process releases heat energy into the environment?

10.Which of the following best describes the role of the ocean in the water cycle?

11.What is the name of the zone where continuous water exchange occurs between surface water and groundwater in river valleys?

12.Which of the following is an example of precipitation?

13.A student places a sealed bag of ice on a table. After an hour, the bag contains only liquid water. Which processes occurred?

14.The graph shows the amount of water in a soil sample over 24 hours. At which time did rainfall most likely occur? (Graph: time on x-axis, water content on y-axis; steady increase from 0 to 6h, plateau 6-12h, sharp drop 12-18h, then gradual decrease 18-24h)

15.In a laboratory, a student measures that 500 g of water at 25°C evaporates completely over 10 days. How much energy was absorbed during evaporation? (Latent heat of vaporization of water = 2260 J/g)

16.Which process in the water cycle returns water from plants directly to the atmosphere?

17.The table shows the average annual precipitation and evaporation for three regions. Which region has the largest water surplus (precipitation minus evaporation)? (Table: Region A: precip 1200 mm, evap 800 mm; Region B: precip 600 mm, evap 900 mm; Region C: precip 1500 mm, evap 1200 mm)

18.A farmer notices that after paving a large area of land, the nearby river floods more often during heavy rain. Which part of the water cycle was most directly affected?

19.A student models the water cycle in a closed terrarium. After one week, water droplets appear on the glass lid. Which sequence of processes best explains this observation?

20.What is the main energy source that drives the water cycle?

21.In an experiment, a student places a beaker of water on a balance and measures its mass every day. The mass decreases by 2 g per day. What is the rate of evaporation in grams per hour?

22.The diagram shows a cross-section of a river valley. Which zone is the hyporheic zone? (Diagram: river in center, groundwater below, arrows indicating water exchange between river and groundwater in a zone beneath the riverbed)

23.Which statement best explains why clouds form as moist air rises?

24.Approximately what percentage of global evaporation occurs over the oceans?

25.A student sets up an experiment to model the water cycle. She places a beaker of water under a lamp and covers it with a clear plastic sheet. After some time, water droplets form on the underside of the plastic sheet. Which processes are being modeled?

26.In a laboratory, a student places 200 g of water at 20°C in a shallow dish and leaves it on a balance. After 5 days, the mass has decreased by 10 g. Assuming the rate of evaporation is constant, what is the average rate of evaporation per day?

27.A student wants to investigate how temperature affects the rate of evaporation. She uses three identical beakers with equal amounts of water, places them at different temperatures (10°C, 25°C, 40°C), and measures the mass of water lost after 24 hours. What is the independent variable in this experiment?

28.The table shows the average annual precipitation and evaporation for three regions. Which region has the largest water surplus (precipitation minus evaporation)? Region A: Precipitation 1200 mm, Evaporation 800 mm Region B: Precipitation 600 mm, Evaporation 700 mm Region C: Precipitation 900 mm, Evaporation 500 mm

29.Which of the following is a process that returns water from plants directly to the atmosphere?

30.A farmer notices that after paving a large area of land, the nearby river floods more often during heavy rain. Which part of the water cycle was most directly affected by the paving?

31.In an experiment, a student places a beaker of water on a balance and measures its mass every day. The mass decreases by 2 g per day. What is the rate of evaporation in grams per day if the surface area of the water is 50 cm²?

32.The diagram shows a cross-section of a river valley. Which zone is the hyporheic zone? (Diagram: river in center, groundwater below, arrows indicating water exchange between surface water and groundwater)

33.A student wants to measure the amount of water that infiltrates into soil in a garden. She pours 1 liter of water onto a 0.5 m² area and measures that 0.7 liters drains away as runoff after 10 minutes. How much water infiltrated into the soil?

34.The graph shows the amount of water in a soil sample over 24 hours. At which time did rainfall most likely occur? (Graph: time on x-axis, water content on y-axis; water content increases sharply at 6:00, then decreases gradually)

35.Which of the following is the main source of energy that drives the water cycle?

36.What is the process by which water vapor changes into liquid water?

37.Which term describes water that flows over the ground surface and into rivers?

38.Which of the following processes returns water from plants directly to the atmosphere?

39.Which of the following statements about the water cycle is correct?

40.In an experiment, a student places 200 g of water at 20°C in a shallow dish and leaves it on a balance. After 5 days, the mass has decreased by 10 g. Assuming the rate of evaporation is constant, how much energy was absorbed by the water during the entire 5 days? (Latent heat of vaporization of water = 2260 J/g)