Earthquake magnitude

import csv
def setup():
    size(800, 1000)
    with open("quakes.csv") as f:
        reader = csv.reader(f)
        header = reader.next() # Skip the header row.    
        global magnitudes
        magnitudes = []
        for row in reader:
            magnitude = float(row[4])
            magnitudes.append(magnitude)
def draw():
    background(0)
    scalar=100
    y = 0
    for magnitude in magnitudes:
        aboveEdge = y
        belowEdge = y+20
        if aboveEdge < mouseY and mouseY < belowEdge:
            if magnitude*scalar>70:
                fill(242, 47, 21)
                rect(50, y, magnitude*scalar*2,20)
            else:
                fill(21, 131, 241)   
                rect(50, y, magnitude*scalar,20)
        else:
            fill(219, 219, 221)   
            rect(50, y, magnitude*scalar,20)
        y +=20

If the magnitute is greater than 7, it is destructive. Highlight it with red color and double the length of bars.