The distance from the earthquake`s focus.
Growing grass plants and trees is the easiest and best way to prevent flood waters from running off too quickly causing further soil erosion. <span />
distance
speed = — ————
time
s= 30m
———
6s
the average speed of the marble is 5s/m
Compared to the frequency and wavelength of the radio signal emitted from
the antenna, the radio signal received by the astronauts has a (<span>1) lower frequency and a shorter wavelength.</span>