Earth's Layers
The ___________ is the outside layer of the earth that we live on.
crust
The theory of ____________ ______________ tells us that Earth's crust is broken into pieces that float and move on top of the mantle.
plate tectonics
Plates are moving toward each other at ________________ plate boundaries
convergent
A(n) ______________ volcano is a volcano that is currently erupting.
alive
________________ is the measurement of the strength of an earthquake
Magnitude
The ______________ is the layer of the earth inside of the crust.
mantle
Alfred Wegener came up with a theory called ________________ __________ that says that all of Earth's continents are moving away from each other.
continental drift
Plates are moving away from each other at _______________ plate boundaries.
divergent
A(n) _____________ volcano is a volcano that has erupted recently or will erupt again soon.
active
A(n) ___________________ is a smaller earthquake that comes after the main earthquake.
aftershock
The mantle is made of _____________.
magma
In Wegener's theory, what is the name of the one continent that all of the other continents used to be a part of?
Pangaea
Plates are moving alongside each other at ______________ plate boundaries.
transform
A(n) ______________ volcano is a volcano that can never erupt again
extinct
The ________________ of an earthquake is the exact point under the Earth's surface where an earthquake starts
hypocenter/focus
outer core
Wegener thought the continents were moving away from each other because of _______________ plate boundaries.
divergent
The strongest earthquakes happen at ______________ plate boundaries.
transform
A(n) ______________ volcano is a volcano that hasn't erupted for a long time and doesn't seem like it will erupt soon.
dormant.
The closest point on Earth's surface to where the earthquake started is the ______________
epicenter
Why is the inner core solid even though it is so hot?
It is under extreme pressure
South America and Africa
_________________ happens at convergent plate boundaries when one plate is forced underneath another.
Subduction
What are two positive effects of volcanic eruptions?
(Many possible answers)
Earthquakes are caused by _____________ _________ that are released when built up pressure is released suddenly
seismic waves