Define infrasound

Define ultrasound

Give four uses of infrasound

Give three uses of ultrasound

A ship detects a sonar pulse 3 seconds after it was emitted. The speed of sound in water is 1500m/s. Calculate the depth of the water and the distance the wave has travelled.

What two events cause seismic waves?

Seismic waves can be S or P waves. What type of wave are each of these?

What two things can happen to a seismic wave at boundaries between the crust, mantle or core?

What is the outermost layer of the earth composed of and what do these do?

What natural event can happen at a plate boundary and what is released?