Transcript Comparing Densities of Earth`s Layers

 (Write
this) If everything is made of
atoms…
 and
atoms combine to make
molecules,…
…which
in turn move about based
on whether they are a solid, liquid or
gas,…
 …and
these molecules or particles
position themselves in a mixture based
on their density (amt. of stuff in a given
space), …
 …and
we recognize that Earth is made of
larger particles called rocks…
?
?
?
?
?
?
?
?
?
?
Outer Core
Troposphere
Mantle
Exosphere
Upper Mantle
Inner Core
Crust
Stratosphere
Mesosphere
Thermosphere











Thermosphere:
100-400 km
Meteorites burn
up and Aurora
Borealis found
Mesosphere:
25-100 km
Stratosphere:
10-25 km
Ozone layer that
protects from
harmful UV found
Troposphere:
0-10 km
closest to the
earth
 Carbon
Dioxide
1.562 g/ml
 Oxygen
 Argon
1.429 g/ml
1.784g/ml
 Nitrogen
1.251 g/ml
 Hydrogen
.085 g/ml
 What
we think we
know, comes from
a study of how
earthquake
(seismic) waves
travel through the
earth, and how
long it takes for
them to get from
where the
earthquake
happens to a
recording station.
 The
basic idea is that
different materials
transmit seismic
waves at different
speeds. With a lot of
earthquakes and a lot
of recording stations,
geophysicists are
beginning to get a
pretty detailed
picture of what is
probably down there.
 One
of the most
distinctive features
of the earth's
interior is how it
seems to be layered
with the heaviest
stuff in the center,
and the lightest
material at the
surface.
 In
fact, the earth
probably looks a lot like a
hard boiled egg if you
could cut it open. The
yellow stuff in the center
(the yolk) relates to what
we call the core.
 Most geophysicists think
that the core is composed
of high density materials
like iron and nickel.
 The
egg's shell is
like the earth's
crust - a thin
veneer of rigid,
low density
material at the
surface.
 And
all the white
stuff in between is
like the earth's
mantle - the largest
layer which, in the
case of the earth, is
of medium density,
and, in the case of
an egg, tastes best
with a bit of salt and
pepper.
The core seems to be
in two parts - a "solid"
inner core with a
"liquid" outer layer and is the final resting
place for as much of
the high density
material as can get
there..
The
crust is
REAL thin
relative to the
size of the earth
- much, much
thinner than an
eggshell, and is
of much lower
density than the
core.

It is probable that the
mantle represents the
vast majority of the
earth's mass which is
still trying to figure out
if it is heavy enough to
be accepted at the
core, or is lower in
density and therefore
has to float about on
the surface with the
rest of the scum
Layer
Material
Continental Silicon/
Crust
oxygen
Density
2.7
g/cm3
?
Oceanic
Crust
Iron /
3.0
Magnesium g/cm3
Mantle
Iron/
3.3
Magnesium g/cm3
Outer Core
Liquid
Iron/Nickel
Inner Core
Solid
Iron/Nickel
?
?
9.9
g/cm3
?
12.6
?
g/cm3
12.6 g/cm3
2.7 g/cm3
3.0 g/cm3
9.9 g/cm3
3.3 g/cm3


Tectonic Processes
http://vss.sd22.bc.ca/hpp/courses/geo12/course_material/unit3/U03L01.htm


Visual Dictionary Online
http://visual.merriam-webster.com/earth/geology/structure-earth.php


World of Teaching
www.worldofteaching.com


Ask Geoman
http://jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry57.html


Earth’s Structure
http://mediatheek.thinkquest.nl/~ll125/en/struct.htm


Quezi ‘Now You Know’
http://quezi.com/11983


My ScienceBox
http://www.mysciencebox.org/node/559