//change 5 to the total number of questions
var total=5
var question=new Array()
for (i=1;i<=total+1;i++){
temp="choice"+i+"=new Array()"
eval(temp)
}
var solution=new Array()
var explanation=new Array()

/*Below lists the questions, its choices,the solution,  and finally the explanation to each question. Follow the exact format below when editing the questions. You may have as many questions as needed.*/

question[1]=" Which is NOT an ingredient needed for a tornado to form?"
choice1[1]=" Severe thunderstorm"
choice1[2]=" Rising air"
choice1[3]=" Change in wind speed and direction"
choice1[4]=" Hail"

question[2]=" Which scale is used to measure the strength of a tornado?"
choice2[1]=" Saffir-Simpson Scale"
choice2[2]=" Enhanced Fujita Scale"
choice2[3]=" Richter Scale"
choice2[4]=" None of the above"

question[3]=" On average, how many tornadoes occur in the United States every year?"
choice3[1]=" 70"
choice3[2]=" 3"
choice3[3]=" 350"
choice3[4]=" 1000"

question[4]=" Which of the following terms indicates that a tornado has already been spotted near your community?"
choice4[1]=" Chance"
choice4[2]=" Watch"
choice4[3]=" Warning"
choice4[4]=" None of the above"

question[5]=" If there is a tornado warning issued for your city or town, where is the safest place to be?"
choice5[1]=" In a field"
choice5[2]=" In a car"
choice5[3]=" In your house or school"
choice5[4]=" At the mall"

solution[1]="d"
solution[2]="b"
solution[3]="d"
solution[4]="c"
solution[5]="c"

explanation[1]="Hail usually falls nearby a tornado, but it is not necessary for a tornado to form. A tornado is created by a giant thunderstorm (called a supercell) that has plenty of warm air rising up into the thundercloud. High above the ground, the rising air can start rotating if there are strong winds that change direction, forming a vortex, an area of strong rotation within the center of the cloud. A tornado can form from the cloud to the ground beneath the vortex."
explanation[2]="The Enhanced Fujita (EF) scale is a tool used by meteorologists to estimate the wind speeds of a tornado (the scale was called the Fujita scale until 2007.) After a tornado hits, scientists assess the damage created by their winds. The scale goes from 0 to 5. Tornadoes that do very little damage to buildings and outdoor structures are lowest on the scale. For example, an EF-0 tornado, the weakest rating, can cause damage to the side of houses or rip off window shingles. Scientists estimate EF-0 tornadoes as having wind speeds from 65 to 85 miles per hour. The strongest tornadoes are assigned the highest numbers. A rare EF-5 tornado can do severe damage, cause many deaths and destroy a whole town! Scientists estimate EF-5 wind speeds are over 200 miles per hour! The EF scale uses only estimates wind speeds, since the actual wind speeds inside a tornado cannot be measured. The Saffir-Simpson scale is used to measure wind speeds in hurricanes, based on measurements taken from airplanes that fly into the center of the storms. The Richter scale is used to measure how much the ground shakes during earthquakes, usually on a scale of 1 to 10."
explanation[3]="Of the many countries around the world that have tornadoes, the U.S. experiences the most, over 1000 per year! Tornadoes can happen at any time of year in any state. Most tornadoes occur in a central area of the country called Tornado Alley, which includes parts of Texas, Oklahoma, Colorado, Kansas, Nebraska and South Dakota (Texas receives more tornadoes than any other U.S. state.) The land in Tornado Alley is flat, and the air above is a meeting place for warm, moist air moving north from the Gulf of Mexico and cold, dry air moving south from Canada. This boundary is where most tornadoes form. Florida also receives a lot of tornadoes."
explanation[4]="A tornado watch indicates that a tornado is possible within a certain area, but may not happen. The National Weather Service will usually announce a tornado watch before a tornado warning. A tornado warning means that a tornado has been spotted, or that a rotating cloud that can lead to a tornado has been seen on Doppler radar by meteorologists. The term \"chance\" is not an official word used to warn people of severe weather."
explanation[5]="The basement or lowest floor of a sturdy building is the safest place out of these options. During a tornado warning, you should put as many walls as you can between you and the tornado. A field offers no protection from a tornado\'s winds, and neither does a car. Even though a mall has walls, it also has a large roof that could collapse during a tornado, and a lot of objects that could be picked up and blown at you by the tornado\'s wind. Go to a secure room with few or no windows in a basement or lowest floor. Stand under a door frame, in a closet, or in a bathtub. Some communities even have certified tornado shelters or \"safe rooms.\" You might want to find a \"safe room\" in your house. Ask your parents to help. If you hear that there is a tornado watch for your community, you should follow the advice of adults nearby, listen to a weather radio or your local TV station, stay alert and prepare as though a tornado could be coming."