infrasound

Question 1

what is infrasound

Answer 1

frequencies lower than 20Hz

Question 2

what produces infrasound

Answer 2

volcanos, avalanches, earthquakes in their local area

Question 3

what is produced when there are earthquakes

Answer 3

seismic waves at a range of frequencies that travel throughout the earth

Question 4

how are waves detected over the planet

Answer 4

seismometers

Question 5

what are P waves

Answer 5

longitudinal seismic waves that can travel through liquids and solids
are refracted by the liquid outer core and mantle as it’s not fully liquid
faster than S waves

Question 6

what are S waves

Answer 6

transverse waves that can’t travel through liquids
can’t pass through liquid outer core and can’t reach inner core

Question 7

how we’re scientists able to discover the internal structure of the earth

Answer 7

measuring which types of waves were detected at different parts of the earth

Question 8

what can travel through the earths core and what can’t

Answer 8

P waves can travel through the core but S waves cant