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Structure
of Earth
Earth has Seafloor
Plate
Plate
Four parts Spreading Tectonics I Tectonics II
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Final Jeopardy
The thin, rigid outer layer of Earth
that includes the surface.
What is the crust?
The thickest layer of Earth,
mostly hot rock.
What is the mantle?
The part of Earth’s center that is
composed of liquid iron and nickel.
What is the outer core?
The crust and the uppermost part of
the mantle that is rigid.
What is the lithosphere?
The hotter, softer layer of the upper
mantle upon which the lithosphere
floats.
What is the asthenosphere?
This is the most abundant gas in
Earth’s atmosphere.
What is Nitrogen?
These are Earth’s layers from inside
to out.
What is inner core, outer core,
mantle, and crust?
All living things on Earth are called
the ____.
What is the biosphere?
All the fresh water and salt water on
Earth is known as this.
What is the hydrosphere?
This is an organized group of parts
that work together to form a whole.
What is a system?
A long narrow chain of
mountains that runs along the
Atlantic Ocean floor.
What is the Mid-Atlantic Ridge?
The deepest regions of
the ocean floor.
What are trenches?
Compared with rocks near
the trenches, rocks near the
ocean ridges are this.
What is younger?
This is formed at ocean ridges.
What is ocean crust?
Rocks on the ocean floor show
reversals in the polarity of this over
geologic time.
What is Earth’s magnetic field?
A slab of lithosphere that moves on
Earth’s surface.
What is a plate?
A place where two plates are moving
toward each other.
What is a convergent
plate boundary?
A place where two plates are moving
away from each other.
What is a divergent plate boundary?
A place where two plates are sliding
past each other.
What is a transform plate boundary?
The process of one plate descending
beneath the other.
What is subduction?
These circular flows of hot, molten
matter in the upper mantle may
cause plate motion.
What are convection currents?
Hot mantle material rises because of
this property compared to its
surroundings.
What is lower density?
Tall mountains form at this type of
convergent boundary.
What is a continent- continent
collision?
A force in which the weight of a
subducting plate pulls on the rest of
the plate.
What is slab pull?
The name of a valley in East Africa
where two plates are spreading.
The Great Rift Valley
Daily Double
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Final Jeopardy
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Earth is considered this type of
system because matter cannot
leave the system.
What is a closed system?