What are these waves called?

What are Seismometers?

The place inside the Earth where rock suddenly moves or fractures is called the...

What is the epicentre?

What two types of waves do earthquakes cause?

What two types of waves do earthquakes cause?

What do P waves do?

What do S waves do?

What is the outermost layer of the Earth made out of?

Tectonic plates are pushed by very slow moving...

What is frequency?

What is it measured in?

What are sound waves?

What does the frequency of a sound wave determine?

Humans can hear sounds in the frequency range....

What are sounds with frequencies below 20Hz called?

How are they detected?

What is Infrasound useful for?

Natural events such as volcanic eruptions create...

What are sounds with frequencies higher than 20kHz called?

What is Sonar equipment used for? And where is it carried?

What happens when an ultrasound scan is made?

What are earthquakes? And what do they cause?