Gravitational Potential Energy is affected by position. Like the leaves on trees, anything that is raised up has the potential to fall. It has potential energy. You can see examples of people with gravitational potential energy in 1.5 Figure below. Gravitational potential energy depends on two things. It depends on its weight, because a large falling rock can do more damage than a leaf falling from a tree. It also depends on its height above the ground. Like the skateboarder, the higher the ramp, the faster he will be going when he reaches the bottom. Like all energy, gravitational potential energy has the ability to do work. In this case, weight has the potential to deliver a force. More important for us is that it has the ability to cause change. What kind of change you may ask? Gravitational potential energy has the ability to cause motion. 

Question: "What two things can gravitation potential energy do?"

Answer: "Shrink and expand objects"

Response: no


The old vaulted church was stripped down: there was no cloth on the altar, just a DJ's toolkit and his beer. Through the dark, I could see three bolts left in the wall from where they'd taken down the crucifix. A confessional too beaten-up to have been sold was shaking in a way that suggested activity inside, and where the pews had been taken out, a couple hundred people were testifying to the DJ's moving sermon. Rachel stepped forward into the crowd while I took a moment to drink in the ceiling's blue-lit, shadowed vault and the light-catching haze from who-knows-what rising between the DJ and the crowd. There was a terrific echo, each beat reverberating inside of the next, and the old stained-glass windows rattled in their frames. On the dance floor, people moved with their eyes closed and their hands in the air. I danced with Rachel for a while, but then something by the bar seemed to be pulling her eyes. She told me that she was heading for a drink and slipped out of the crowd. When she hadn't come back halfway through the next song, I glanced over at the bar. It was just a little set-up where someone had stacked a few crates and brought something alcoholic to share, mostly beer. Rachel was standing with a plastic cup, looking like she was having a conversation, but I couldn't see anyone else there. The next time the crowd split, I saw him. He stood in front of a blue light, so I couldn't see him clearly, but what I saw was memorable. He wore a jacket of what might have been blue velvet, and his hair gleamed black against his white skin. The blue haze seemed to stop just shy of his pallor, setting off his striking face without illuminating its details, and his wrists flashed white in the darkness. He didn't move, just stared and held his drink. The next time I saw them, his mouth was moving. She nodded and he took her arm. I watched them through the crush of dancers as they squeezed along the wall, and the feeling came to me that something was very wrong. Saturday morning, I woke up and saw that she still hadn't come home. 

Question: "What was left when the crucifix was taken down from the wall at the old vaulted church?"

Answer: "Three bolts in the wall"

Response: yes


 Bin Laden reportedly discussed the planes operation with KSM and Atef in a series of meetings in the spring of 1999 at the al Matar complex near Kandahar. KSM's original concept of using one of the hijacked planes to make a media statement was scrapped, but  Bin Laden considered the basic idea feasible.  Bin Laden, Atef, and KSM developed an initial list of targets. These included the White House, the U.S. Capitol, the Pentagon, and the World Trade Center. According to KSM,  Bin Laden wanted to destroy the White House and the Pentagon, KSM wanted to strike the World Trade Center, and all of them wanted to hit the Capitol. No one else was involved in the initial selection of targets.  Bin Laden also soon selected four individuals to serve as suicide operatives: Khalid al Mihdhar, Nawaf al Hazmi, Khallad, and Abu Bara al Yemeni. During the al Matar meetings,  Bin Laden told KSM that Mihdhar and Hazmi were so eager to participate in an operation against the United States that they had already obtained U.S. visas. KSM states that they had done so on their own after the suicide of their friend Azzam (Nashiri's cousin) in carrying out the Nairobi bombing. KSM had not met them. His only guidance from  Bin Laden was that the two should eventually go to the United States for pilot training. Hazmi and Mihdhar were Saudi nationals, born in Mecca. Like the others in this initial group of selectees, they were already experienced mujahideen. They had traveled together to fight in Bosnia in a group that journeyed to the Balkans in 1995. By the time Hazmi and Mihdhar were assigned to the planes operation in early 1999, they had visited Afghanistan on several occasions. Khallad was another veteran mujahid, like much of his family. His father had been expelled from Yemen because of his extremist views. Khallad had grown up in Saudi Arabia, where his father knew  Bin Laden, Abdullah Azzam, and Omar Abdel Rahman (the "Blind Sheikh"). 

Question: "Were the four suicide bombers experienced pilots?"

Answer: "Yes"

Response: yes


Water flowing over Earths surface or underground causes erosion and deposition. Water flowing over a steeper slope moves faster and causes more erosion. How water transports particles depends on their size. When water slows down, it starts depositing sediment. This process starts with the largest particles first. Runoff erodes the land after a heavy rain. It picks up sediment. Runoff carries most of the sediment to bodies of water. Mountain streams erode narrow, V-shaped valleys and waterfalls. Erosion and deposition by slow-flowing rivers create broad floodplains and meanders. Deposition by streams and rivers may form alluvial fans and deltas. Floodwaters may deposit natural levees. Erosion and deposition by groundwater can form caves and sinkholes. Stalactites and stalagmites are mineral deposits. They build up in caves as water continues to drip. 

Question: "What is picked up by the water?"

Answer: "Groundwater"

Response:
no