Layers of the Earth Flashcards
- outermost layer of the earth
- 6-45 km thick
crust
- boundary between crust and mantle
- 700 km thick
mohorovicic discontinuity
- central part of the earth
- rich in sulfur and iron
core
- 6 km thick
- made of basalt
oceanic crust
- solid part of the core
- 1220 km thick
inner core
- 84% of the earth’s volume
- rich in peridotite (rock)
mantle
- boundary between inner and outer core
lehmann discontinuity
- 30-40 km thick, made of graphite/andesite and basalt
continental crust
- only liquid layer of the earth
- 2550 km thick
- responsible for earth’s magnetic field
outer core
- boundary between lower mantle and upper core
guternberg discontinuity
True or False
The earth is divided into several plates that move and collide with each other.
True
True or False
The earth is divided into several plates that move and collide with each other.
True
A fault that has moved once or more times in the last 10,000 years
Active Fault
A fault that has moved once or more times in the last 10,000 years
Active Fault
It is a line on the earth’s surface that is caused by the fault plane
Fault Trace
A type of fault in which the hanging wall moves down and the force is pulling apart
Normal Fault
- a fracture or crack
- usually found in tectonic plate boundaries
Fault
True or False
Movement along fault planes generate earthquakes
False
Movement along [fault lines] generate earthquakes
A fault that has not moved for millions of years
Inactive Fault
A type of fault in which the movement is horizontal or sideways and is also known as transcurrent fault.
Strike-Slip Fault
- flat surface where the movement occurs
- may be vertical or sloping
Fault Plane
Found under fault plane
Footwall
A type of fault in which the hanging wall moves up and the force is pushing together.
Reverse Fault
A type of fault in which the hanging wall moves up and the force is pushing together.
Reverse Fault
Found above the fault plane
Hanging Wall
