Which of the following irrigation methods is most efficient in terms of maximizing water absorbed by plants and minimizing water lost to the system?

Which of the following household activities consumes the most water?

___________ percent of the Earth's surface is covered by water and the oceans currently contain __________ percent of the Earth's water.

Water is one of the most important resources necessary for sustaining life on Earth. How much of our water by volume is found in the oceans?

Many rivers along the coast will move water from the terrestrial ecosystem into the oceans. What is the region where the river meets the ocean?

Approximately what percentage of people in the United States rely on groundwater for their water supplies?

What is the region where water collects and drains within the landscape?

Curtis owns a cottage on a freshwater lake in the Upper Peninsula. When he goes swimming in the lake, he sticks close to the shallow waters along the shore. In which layer of the lake is Curtis swimming?

What percent of the world's fresh water use is for agriculture?