Why might the ancient Egyptians have wanted to control the Nile's flood waters? PLS HELP

Mr. mann's science students were experimenting with speed. they set up a 1 meter (100 cm) track. the students used balls instead of cars. the balls were different sizes and made of different materials. four at a time, students rolled balls around the track to see which had the fastest and slowest speeds. some of their data are shown in the table. which ball will take the longest to complete one lap around the track?

What happens in puerto rico in 2012 to celebrate the anniversary of clemente's 3000th hit

Music the height of a wave or the amount of the wave carries is the amplitude. a. air b. nodes c. speed d. energy