Earth has a tremendous amount of water. So why is water sometimes a scarce resource? What are the reservoirs for water?
What is residence time? What does it mean to say the residence time of water in the atmosphere is nine days?
According to the video, how much of Earth's surface is covered with water? What is most of this water in?
According to the video, what percent of Earth's water is salty? How much is fresh water?
According to the video, of all of the freshwater, what percentage is ice, what is shallow groundwater, what is deep groundwater, what is in lakes and rivers and what is in the atmosphere as water vapor?
According to the video, how much of Earth's freshwater is available for human consumption?
How does the use of repetition affect the narrator’s tone in this passage

Which of these is a role of congress? a) to veto legislation b) to pass the federal budget c) to nominate cabinet members d) to interpret the constitution 2) which of these is a power of the legislative branch? a) declare war b) enforces laws c) interprets laws d) negotiates treaties 3) a two/thirds vote of each house of congress is required to a) impeach the u. s. president. b) approve presidential appointments. c) pass an appropriation or tax bill. d) pass a bill over the president's veto. 4) the chief purpose of congressional committees is to a) draft legislation for consideration by the full congress. b) act as a group to which the president can direct his lobbying effort. c) provide a place for lobbyists and special interest groups to get support. d) hold hearings so that bills can be evaluated and studied prior to voting. 5) after a bill has been passed by both houses of congress it a) becomes a law. b) is sent to the president. c) returns to the house of origin for verification. d) is sent to a subcommittee in the house or senate. 6) house of representatives passes a spending bill → senate debates the spending bill → senate passes the spending bill → ? what completes this sequence of events? a) the spending bill becomes a law b) the states must approve the bill c) the supreme court reviews the bill d) the president must act on the bill eliminate