Seismic waves
Step-by-step explanation:
An earthquake releases energy as shock waves, the so-called seismic waves, which ripple across the earth's surface. The seismic waves created as they move from the epicentre an earthquake vary.
(from Google)
Answer:
Step-by-step explanation:
=
12
x
3
−
40
x
2
+
42
x
−
20 Is your answer
M^2 = 49
M^2 = 7^2
M = -7 and M = 7
