Vocabulary
How Earths Plates move
Earthquakes
Volcanoes
Earths spellings
100
define the word crust
its the earths outermost layer
100
what boundary means that the plates are moving away from eachother
its called divergent boundary
100
what does earthquake mean?
a sudden jolt which releases energy as vibrations
100
what is a volcanoe
its a mountain that may form around the opening as the lava or cinders build up.
100
Magma is slowly pushed up through the cracks in the rift and then cools down to form a __________?(remember to spell it after)
sea floor spreading
200
define the word mantle
its directly beneath the crust
200
what boundary collides
its called convergent boundary
200
what instrument is used to measure the amount of energy released during a earthquake
Richter
200
what does a cinder cone volacanoe look like?
it is built up from ashes, cinders, and rocks. It looks like a big circle
200
the cause of vibration that make right angles is called_______
s-wave
300
define the word core
its is the innermost layer of the earth
300
what boundary grinds past eachother
its called transform boundary
300
what is directly above the focus
What is epicenter
300
how does a volcanoe form?
its when the crust is destroyed by a collision at the edge of a plate. At s rift new plate material forms
300
it travels only at the surface and moves less quickly its called_______
surface waves
400
define the word asthenoshere
its a zone of weak easily deformed rock
400
a chain of mountains that runs 83,000 km. through all the worlds oceans is called what?
it is called mid-ocean ridge
400
what are p waves?
they are push-pull waves that cause back and forth vibrations in the same direction the waves move
400
what is a hot spot?
its a single column of magma
400
its an instrument that detects earthquakes waves
seismograph
500
what does lithosphere mean?
the lithosphere floats right on top of the asthenosphere and includes all of the crust and part of the upper mantle
500
what happens along a divergent boundary?
it seperates and lava comes through it and cools down or sea floor spreading
500
what type of boundary causes an earthquake
a transform boundary
500
where do oceanic plates move?
it moves down and under a continental plate along a convergent boundary
500
about 225 million years ago there was something called the supercontinent what was the name for it?
pangea
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