Volcanoes form when magma rises up from under the earth's crust through vents and fractures. The document discusses how plate tectonics can cause pressure to build, pushing magma upwards and causing volcanic eruptions. It also explains key volcano features like magma, dikes, sills, vents, and craters. Volcanic eruptions ultimately change the lithosphere by creating new mountains and landforms on the earth's surface.

1. 6TH Grade Science NC 3.01
Niki Ward
7-12-09

2. CONTENT
ASSESSMENT
END SHOW

3. http://www.youtube.com/watch?v=He
c9yk-QQ4o
•A volcano is a vent: a fissure in the
earth's crust (or in the surface of
some other planet) through which
molten lava and gases erupt
•Volcanoes change the Lithosphere
by creating Faults, and mountains
in the Earth’s Surface
•The prime cause of a volcano
eruption is the movement of the
tectonic plates. This causes
pressure at the base of the volcano
pushing the magma upwards.

4. Volcanoes go through “Life Stages”

5. http://www.youtube.com/watch?v=He
c9yk-QQ4o
•A volcano is a vent: a fissure in the
earth's crust (or in the surface of
some other planet) through which
molten lava and gases erupt
•Volcanoes change the Lithosphere
by creating Faults, and mountains
in the Earth’s Surface
•The prime cause of a volcano
eruption is the movement of the
tectonic plates. This causes
pressure at the base of the volcano
pushing the magma upwards.

6. •Before lava hits the air it is known as magma.
Magma is under pressure when it is below the
Lithosphere
•The Sill is the stem of Magma that is in
between the Earth’s surface and the base of the
volcano
•The vent is in the middle of the volcano and is
the passage for magma to travel when there is
too much built up pressure
•The Dike is a visible vein in the volcano it is
the path of magma.
•The Crater is the very top of the volcano where
the opening is.
•The magma becomes lava as soon as it
reaches the crater.
•From the explosion comes a mixture of
gasses, ashes, and cinders this is often what
people see first when the volcano is in the
eruption process.

7. •Once the eruption is over the Lava cools, hardens
and cracks creating a new surface
•The ground is very fertile and new vegetation life
grows.
•There is a residue of hard molten rocks which
people use to help build roads and even buildings

8. A. Thoilete Pillows
B. Atoll
C. Seamount
D. Submarine Alkalics

9. A. Crater
B. Vent
C. Sill
D. Dike

10. TRUE
FALSE

11. A. By creating Faults, and mountains in
the Earth’s Surface
B. By covering the surface with a new
smooth layer of soil
C. By producing new areas for lakes
D. It does not change the lithosphere

12. TRUE
FALSE

13.  This is the correct answer to the question
remember this answer because you may see it
on an upcoming test!!!

14.  Don’t give up try to think back to what we
have talked about in this unit! Make sure you
learn the correct answer because you may see
this in an upcoming test!

15.  http://images.google.com/imgres?imgurl=http://starryskies.com/solar_system/venus_html/la
va_domes2.jpg&imgrefurl=http://starryskies.com/solar_system/venus_html/volcanism_on_ven
us.htm&usg=__njil-jwtWNO2pASXFyj8EYkK-
0Y=&h=376&w=477&sz=36&hl=en&start=11&um=1&tbnid=6fvGnr33GTKKoM:&tbnh=102&t
bnw=129&prev=/images%3Fq%3Dlava%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:
*:IE-SearchBox%26rlz%3D1I7DKUS%26sa%3DN%26um%3D1
 http://www.hellagems.com/blog/wp-content/uploads/2009/01/volcano-diagram.gif
 http://images.google.com/imgres?imgurl=http://www.odec.ca/projects/2007/lund7j2/volcano.jpg&i
mgrefurl=http://www.odec.ca/projects/2007/lund7j2/what_are_they.htm&usg=__ZNaSrmcEv3pVp4-
74-bERv_7Eqs=&h=700&w=531&sz=29&hl=en&start=55&um=1&tbnid=-fkt-
KlVUKss_M:&tbnh=140&tbnw=106&prev=/images%3Fq%3Dvolcano%26ndsp%3D20%26hl%3Den%26saf
e%3Dactive%26rls%3Dcom.microsoft:*:IE-
SearchBox%26rlz%3D1I7DKUS%26sa%3DN%26start%3D40%26um%3D1
 Volcano World! http://volcano.oregonstate.edu/education/hawaii/flow_rate/rates.html
 http://www.youtube.com/watch?v=Hec9yk-QQ4o