A flood occurs when a river overflows its banks. This might happen because of heavy rains. Floodplains In very flat regions, flood water may spread out on the surface of the land. It then slows down and drops its sediment. If a river floods often, a floodplain develops. A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes. Thats why floodplains are usually good places for growing plants. They are very flat areas and they have very rich soils. The Nile River valley is a great example of a floodplain. Each year, the Nile River rises over its banks. This floodwater carries a lot of sediment. This sediment has been eroded off areas of land from upstream. This sediment is dropped as the water slows down after spreading across the land. What is left behind is a very rich soil. Thats why crops can be raised in the middle of a sandy desert. Natural Levees A flooding river often forms natural levees along its banks. A levee is a raised strip of sediments deposited close to the waters edge.

Question: "What might cause a river to overflow its banks?"

OPTIONS:
- no
- yes

Answer: "River valley"

Response: no

Tuesday, September 11, 2001, dawned temperate and nearly cloudless in the eastern United States. Millions of men and women readied themselves for work. Some made their way to the Twin Towers, the signature structures of the World Trade Center complex in New York City. Others went to Arlington, Virginia, to the Pentagon. Across the Potomac River, the United States Congress was back in session. At the other end of Pennsylvania Avenue, people began to line up for a White House tour. In Sarasota, Florida, President George W. Bush went for an early morning run. For those heading to an airport, weather conditions could not have been better for a safe and pleasant journey. Among the travelers were Mohamed Atta and Abdul Aziz al Omari, who arrived at the airport in Portland, Maine. Boston: American 11 and United 175. Atta and Omari boarded a 6:00 A.M. flight from Portland to Boston's Logan International Airport. When he checked in for his flight to Boston, Atta was selected by a computerized prescreening system known as CAPPS (Computer Assisted Passenger Prescreening System), created to identify passengers who should be subject to special security measures. Under security rules in place at the time, the only consequence of Atta's selection by CAPPS was that his checked bags were held off the plane until it was confirmed that he had boarded the aircraft. This did not hinder Atta's plans. Atta and Omari arrived in Boston at 6:45. Seven minutes later, Atta apparently took a call from Marwan al Shehhi, a longtime colleague who was at another terminal at Logan Airport. They spoke for three minutes. It would be their final conversation.

Question: "What flight was Mohmad Atta on when chosen by CAPPS system?"

Response: "Boston: American 12"
OPTIONS:
- no
- yes

A: no

Problem: (CNN) -- Shain Gandee, one of the stars of the MTV reality show "Buckwild," has been found dead along with two other people in Kanawha County, West Virginia, authorities said Monday. "This is a very sad and tragic event," Kanawha County Commissioner Kent Carper said. "We live in a very small community. Our thoughts and prayers are with the Gandee family." Gandee, 21, was found dead in a vehicle along with his uncle, David Dwight Gandee, 48, and Donald Robert Myers, 27, authorities said. 'Buckwild' producer talks about the show "Earlier this day after releasing information Shain Gandee was missing, the Kanawha County Sheriff's Office received word of a disabled vehicle in a wooded area near Thaxton Hollow, Sissonville, Kanawha County WV," said a statement from the Sheriff's Office. "Deputies and members of the Sissonville Volunteer Fire Department used all terrain vehicles to access that vehicle, a 1984 Ford Bronco belonging to the Gandee family. The vehicle was in a muddy area along a worn path. Inside were the bodies of three people." In a subsequent release, the Sheriff's Office said the vehicle was partially submerged in mud. It was uneven but upright; its muffler was below the surface. Mud covered the lower part of the Bronco's passenger side door, but the driver's side, where the younger Gandee sat, was free, the Sheriff's Office said. Gandee was happy with life before death He was one of the nine cast members of "Buckwild." The show follows a group of young adults trying to have fun in Sissonville, West Virginia, pulling stunts such as turning a dump truck into a swimming pool or just riding around the woods on their all-terrain vehicles. Gandee was billed as a former high school prom king who had done "every job from coal mining to being a garbage man."

Question: "In what area was the vehicle where Shain Gandee died, found?"

Answer: "Near Thaxton Hollow, Sissonville"

OPTIONS:
- no
- yes
Answer: yes

The new administration had already begun exploring possible diplomatic options, retracing many of the paths traveled by its predecessors.U.S. envoys again pressed the Taliban to turn Bin Laden "over to a country where he could face justice" and repeated, yet again, the warning that the Taliban would be held responsible for any al Qaeda attacks on U.S. interests. The Taliban's representatives repeated their old arguments. Deputy Secretary of State Richard Armitage told us that while U.S. diplomats were becoming more active on Afghanistan through the spring and summer of 2001, "it would be wrong for anyone to characterize this as a dramatic shift from the previous administration." In deputies meetings at the end of June, Tenet was tasked to assess the prospects forTaliban cooperation with the United States on al Qaeda. The NSC staff was tasked to flesh out options for dealing with the Taliban. Revisiting these issues tried the patience of some of the officials who felt they had already been down these roads and who found the NSC's procedures slow." We weren't going fast enough,"Armitage told us. Clarke kept arguing that moves against the Taliban and al Qaeda should not have to wait months for a larger review of U.S. policy in South Asia." For the government," Hadley said to us,"we moved it along as fast as we could move it along." As all hope in moving the Taliban faded, debate revived about giving covert assistance to the regime's opponents. Clarke and the CIA's Cofer Black renewed the push to aid the Northern Alliance. Clarke suggested starting with modest aid, just enough to keep the Northern Alliance in the fight and tie down al Qaeda terrorists, without aiming to overthrow the Taliban. Rice, Hadley, and the NSC staff member for Afghanistan, Zalmay Khalilzad, told us they opposed giving aid to the Northern Alliance alone. They argued that the program needed to have a big part for Pashtun opponents of theTaliban. They also thought the program should be conducted on a larger scale than had been suggested. Clarke concurred with the idea of a larger program, but he warned that delay risked the Northern Alliance's final defeat at the hands of the Taliban. During the spring, the CIA, at the NSC's request, had developed draft legal authorities-a presidential finding-to undertake a large-scale program of covert assistance to the Taliban's foes.

Question: "Who thought the program should be larger?"

OPTIONS:
- no
- yes

Answer: "Clarke"

Response:
yes