EASY
thinnest layer of the earth
CRUST
_______________________
30 km
Made of different types of rocks that are light and rich in silicon
- made up of Silica, andesite, basalt
TRUE OR FALSE: Inner core is liquid
False
A type of surface wave characterized by rolling motion that moves up and backward, similar to ocean waves
Rayleigh wave
TRUE OR FALSE: Seismic waves can be used to gather information about interior of the earth
TRUE
True or False: Lehmann Discontinuity is boundary between outer core and inner core
TRUE
______________________________
Discovered by Inge Lehmann in 1936
What is the thickness (in km) of lower mantle (EXACT)
2171 km
True or False: Body waves tend to arrive first before surface waves
TRUE
-----------------------------------------------------------
•BODY WAVES are waves of higher frequency than surface waves
•PRIMARY WAVES travel about 6-7 km/s; first waves detected by seismometers; travel in solid and liquid
•SECONDARY WAVES travel about 5.5 km/s; can pass through only in solid
Boundary between mantle and core
BENO GUTENBERG
Year when Beno Gutenberg discovered the Gutenberg discontinuity
1913
_________________________________________
•Boundary between mantle and core
A type of SEISMIC WAVE that exhibit up and down, rolling motion, and side-to-side vibration
SURFACE WAVE
______________________________________
TYPES:
1. LOVE WAVE- side- side, snake like motion that can damage rigid structures
2. RAYLEIGH WAVE- rolling motion that moves up and backward, similar to ocean waves
TRUE OR FALSE: Continental Crust is thinner than oceanic crust
FALSE
__________________________________________
•CONTINENTAL CRUST is thicker, composed of low density rocks such as granite
•OCEANIC CRUST is thinner, composed of high density rocks such as basalt
Type of rock present in mantle
peridotite
Layer of earth lies beneath the crust
MANTLE
__________________________________________
MANTLE Contribute to tectonic activities
Divided into:
1. Upper Mantle- mostly solid, flexible region, made up of peridotite
2. Lower Mantle- Hotter, denser, warmer, and more stiff; solid
Layer of earth which is made up of nickel- iron alloy
CORE
__________________________________________
Divided into:
1. Outer core- Liquid
2. Inner Core- solid
A discontinuity present between crust and mantle
Moho or Mohorovicic Discontinuity