volcanoes
What is a volcano?
any place where gas, ash, or melted rock come out of the ground
What is a earthquake?
ground movements that occur when blocks of rock in earth move suddenly and release energy
What is the crust?
outermost solid layer of earth
What is a convergent boundary?
where two plates collide
What is magma?
melted rock; denser than solid rock; rises toward surface in volcano
What is a focus?
place within fault at which the first motion of a earth quake occurs
What are the parts of the crust?
The two parts are the continental plates, and oceanic plates
What is a divergent boundary?
Where two plates move away from each other
What is lava?
magma that has reached the earth's surface
What is a epicenter?
above focus on earths surface
What is the mantle?
located in middle or crust and core; hot; slow- flowing; solid rock
What is a transform boundary?
Where two plates slide past each other horizontally
What is a vent?
A opening in a volcano for lava and clouds and ash to erupt from
What is a fault?
break in earth's crust along which blocks of rock move
What is the core?
center; has two parts- inner, outer core; made of iron and nickel; densest layer
What is Pangea?
All continents joined together to make a single landmass
What is a mantle plume?
column of extremely hot mantle rock
What is elastic rebound?
return of rock to it's original shape after elastic deformation
What are the five physical layers?
1. lithosphere
2. asthenosphere
3. mesosphere
4. outer core
5. inner core
What is sea- floor spreading?
explanation of age and magnetic patterns of sea floor rocks