Mechanical Layers
What does the word "mechanical" mean when it comes to mechanical layers?
"moving" or "movement"
The two types of body waves are called...
P waves and S waves
What does the word "composition" in compositional layers mean?
the make-up/what it's made of
What is a shadow zone?
An area on/in the earth where waves cannot reach
The starting point of an earthquake is called?
Epicenter
The least dense layer that contains the crust and upper part of the mantle (where tectonic plates are located)
Lithosphere
the 'P' in P waves stands for ______________ & the 'S' in S waves stands for ______________.
Primary/Secondary or Pressure/Shear
The outermost and least dense layer is the?
Crust
How many shadow zones do P waves have?
2
Any wave caused by an earthquake is?
Seismic Wave
Asthenosphere
This wave can move through Solids only
S waves
The largest layer that accounts for about 70% of the Earth's make-up is the?
Mantle
How many shadow zones do S waves have?
1
The last and most destructive waves are?
Surface waves
Mesosphere
This wave always arrives first
P waves
The densest and hottest layer in the center is the?
Core
Why can't S waves reach the opposite side of the epicenter?
They cannot travel through liquids so they get absorbed
Seismograph/Seisometer
Liquid iron and nickel. Extremely hot and dense
Outer Core
P waves are ______________ waves(parallel) and S waves are _______________(perpendicular)
longitudinal/transverse
Why is the inner core solid?
It is extremely dense
What happens to P waves as they enter a new medium?
They refract/bend
the degree of compactness of a substance
Density