How do scientists study the Earth?
- They use direct
observation (drilling rock samples of our Earth)
- They use
indirect observation (instruments & technology)
- Seismic Waves
– shock waves produced by the energy of the earth (earthquakes)
- Two types of
seismic waves: S-waves and P-waves
– instrument that records the two types of waves that penetrate the
earth’s interior and return to the surface
- The two waves
behave differently when they ‘hit’ different structured materials.
- P waves
do not move well through liquid and S waves stop
What are the three main layers of the
- The Crust,
the Mantle and the Core
the temperature of Earth
change as we travel through its layers?
- The top 20 meters
- After that, every
40meters down, the temperature rises 1ºC. This continues for many
kilometers then it slows down but still rises
- This heat in the
center of Earth is from two things - left over heat from the
creation of planet Earth and radiation inside our core
the pressure of Earth change
as we travel through its layers?
- The deeper you
travel, the greater the pressure - more layers are pressing down.