Earth Science chapter 8
In the early 20th century, Alfred Wegener proposed the theory of...
Continental drift
Hypothesis by Alfred Wegener
continental drift
Island arcs from at _____ boundaries
convergent
Plates come together at _____ boundaries.
convergent
The Himalayas are getting higher because of _____ boundaries.
convergent
Trenches form at _____ boundaries
convergent
mountains (above sea level) that contain volcanoes would be found at _____ boundaries.
convergent
subduction zones occur at _____ boundaries.
convergent
Ocean ridges form at _____ boundaries.
divergent
Plates move apart at ____ boundaries.
divergent
new sea floor is created at _____ boundaries.
divergent
the age of the crust increases as you move away from _____ boundaries.
divergent
sea floor spreading is...
driven by convection cells, creates new crust along mid-ocean ridges, helps explain continental drift
Four lines of evidence that Wegener used to support his theory are...
fit of the continents, rock type, fossils, and climate
when two ocean plates converge, the one that subducts is _____
more dense
In which layer of the Earth are the convection currents located (specifically)?
Asthenosphere
plasticlike layer of mantle
Asthenosphere
Layer of solid iron
Inner core
top layers of the Earth, broken into pieces
Lithosphere
Alfred Wegener's supercontinent is called _____
Pangea
Means "all lands"
Pangea
Supports idea that newest seafloor is at ridges
Seafloor spreading
Where the old crust moves into the Earth
Subduction Zone
Magnetic field is created
outer core
Earth's lithosphere is broken into separate sections called
tectonic plates
Crust is neither created or destroyed at _____ boundaries.
transform
Earthquakes and possible fault lines are the only feature(s) at _____ boundaries.
transform
plates slide past one another at _____ boundaries.
transform
volcanic activity would not be present at _____ boundaries.
transform
