Name: ______________________________________ Date: _______________ Period: _______
Chapter 7.2: Volcanic Eruptions
1.
Through analysis of the ________________ composition of _____________ rock, geologists have concluded that there are _______ general types of lava. a.
____________ lava i.
_______________ colored when hardened. ii.
Rich in _______________________ and ____________. iii.
Forms much of the ________________ crust. iv.
Tends to quietly _______________. b.
_____________ lava i.
High in _______________ with lesser amounts of magnesium and ______________. ii.
______________ color when it hardens. iii.
Common in the _____________________ crust. iv.
Tends to be ________________. c.
___________________ (puh-hoy-hoy) i.
When mafic lava ____________ rapidly, the surface of the flow forms a crust that is ___________________ by movement. This is ____________________ mafic lava with a wrinkled surface. ii.
Pahoehoe means “_____________” in Hawaiian. d.
_______ (ah-ah) i.
Lava that is _________________ rapidly or grows too thick to form __________________, and the surface breaks into
_________________ chunks. Jagged chunks of lava formed by rapid ________________ on the surface of a lava flow. ii.
____ refers to the ______________, _____________ texture of the volcanic rock. e.
Lava _______________ i.
These tubes are created when the ______________ part of the
____________ lava flow cools rapidly and forms a hardened
______________ around a liquid interior which flows out leaving the hardened shell. f.
____________ Lava i.
This is when __________ flows out of ______________ on the ocean floor, _______ rapidly, and separated into rounded ____.

Name: ______________________________________ Date: _______________ Period: _______
2.
Volcanic Rock Fragments a.
_________________ materials are thrown into the air when
_________________ lava explodes. i.
Pyroclastic materials are __________ fragments ejected from a
____________________. ii.
Volcanic _______ is pyroclastic material less than ________ in diameter. iii.
Volcanic _______ is material less than _______ in diameter. iv.
______________ (luh-pil-ie) is material that is less than _____ in diameter.
1.
Means “____________ ____________” in Latin. v.
Volcanic ______________ are large, _______________ shaped
____________ of lava thrown out of the volcano. vi.
Volcanic _______________ are the _______________ possible pyroclastic material that is formed from solid rock __________ from a volcanic __________________.
3.
Volcanic ____________ are piles of _____________ material that build up around the ______________ and there are three main types. a.
_____________ volcanos are ______________ at the base and have gently _________________ sides. i.
These types of ___________________ cover a large area. b.
________________ cones are made of solid ____________________ ejected from the volcano, are very ____________, and are rarely more than a few hundred _________________ high. c.
________________ or _______________________ is a steep sloped volcanic material, ________________ with alternating layers of
____________________ lava flows, and pyroclastic materials.
4.
Craters & Calderas a.
A ________________ is a funnel shaped ________ at the top of a volcanic vent. i.
Craters are formed when ________________ is blown out of the volcano by ______________________. b.
A _____________ forms when the magma _______________ below a volcano is emptied and the volcano ___________________ leaving a large _______________ shaped depression.

Name: ______________________________________ Date: _______________ Period: _______