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8th grade science test 2
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About 80% of the world's earthquakes occur in the
circus-Pacific belt
The earthquake zone stretching from Southern Europe to Indonesia is the
Alpine belt
The inner core of the earth is thought to be
solid
The scale used to measure the damage an earthquake does is the
Moment magnitude scale
A particle or block of solid volcanic ejecta is a
pyroclast
The middle of the earth's three main layers is the
Mantle
The earth's outer layer made of solid rock is
Crust
The central portion of the earth is the
core
Earthquake waves can provide us with information about Earth's
interior
The study of earthquakes
seismology
the study of the earth
geology
What is the point on the earths surface directly above where an earthquake begins?
epicenter
at what point deep in the earth does an earthquake begin
hypocenter
an instrument used to record the vibrations caused by an earthquake is a
seismograph
What major type of fault occurs when rocks on one side of the fault are shoved over the rocks on the other side?
thrust fault
what type of fold occurs when rocks buckle up to form an arch-like structure?
anticline
what is the most abundant element in the earth's crust?
oxygen
what is the area between the upper mantle and the lower mantle?
transition zone
What consists primarily of erupted volcanic ash and rock fragments held loosely together?
Conder-cone volcano
What type of volcano probably will not erupt again?
Extinct volcano
What type of volcano that is inactive but can erupt again?
Dormant volcano
What is the fracture sone between stationary and moving rocks called?
Fault
What is the bottom of the mantle called?
Core-mantle boundary or Gutenberg discontinuity
What is the boundary line between the crust and the mantle called?
MOHO
What type of volcanic ejecta: hardened lava that forms rough jagged rocks with a crumbly texture?
AA
What type of volcanic ejecta: solid particles less than 2mm in diameter
volcanic ash


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