B. Gain information about the current state of the environment and ways to improve it.
Hot liquid rock comes in contact with Earth´s cold crust
I think it is Sodium,hypochlorite
Answer:
f = 33.34 Hz
Explanation:
A wave has a period of 0.03 seconds. It is required to find the frequency of a wave. The relation between time period and frequency is inverse. The time period of a wave is given by :
T = 1/f, f = frequency of wave

So, the frequency of the wave is 33.34 Hz.