Download Science 7--Chapter 14-Lesson 2 Notes1ans

Science 7
Chapter 14--Lesson 2 Notes
Name _______________
13-14
Earthquakes and Volcanoes
liquefaction—solid material acts more like a liquid than a solid due
to extreme shaking
tsunamis—huge ocean waves
Earthquakes can cause huge waves in the ocean from the upward
movement of rock.
volcanoes—landforms that form when magma erupts onto Earth’s
surface as lava
lava—molten rock on Earth’s surface
magma—molten rock below Earth’s surface
Once cause of volcanic eruptions is a decrease in pressure, which causes
rocks to melt more easily.
Continental crust is formed by cooling lava.
Composite volcanoes are cone-shaped. They form as
lava flows and ash layers deposited by explosive eruptions.
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Science 7
Chapter 14--Lesson 2 Notes
Name _______________
13-14
Shield-shaped are large volcanoes formed by many thousands of lava
flows.
volcanic ash
1) Explosive eruptions eject _______________________ high into the
atmosphere.
2) Which landform is NOT associated with volcanic eruptions?
a.
b.
c.
d.
caldera
fault
lava flow
mid-ocean ridge
Transform boundary
3) _____________________ is the type of plate boundary where
volcanoes do not normally form.
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