Continental Drift
Seafloor Spreading
Seafloor Spreading
Who developed the theory of Continental Drift?
Alfred Wegner
How does a trench form?
At a subduction zone
What boundary creates crust?
Convergent Boundary
Which layer of the Earth makes up 70% of the Earth’s mass?
Mantle
A mountain that forms when layers of lava and ash erupt is a(n) ________________.
Volcano
Harry Hess developed what theory? Explain the theory.
Sea Floor Spreading. a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.
Which feature of the ocean floor is a flat area at the bottom of the ocean?
Abyssal Plain
What boundary destroys the crust?
Divergent Boundary
Order the layers of the Earth from least dense to most dense.
crust, mantle, outer core, inner core
What is the main cause of a tsunami & where does a tsunami take place?
Earthquake
Near or underwater
The continents have changed positions over a very long period of time. This means that the plates are __
Moving slowly
Which of the following features on the Earth’s surface is formed by two continental plates converging?
Mountain
This boundary doesn't destroy or create crust? and How are the plates moving?
Transform boundary
Sliding past each other
The continental crust floats on top of the mantle because the crust is
less dense than the mantle
Movement of lithospheric plates, bending of rocks, and breaking of rocks are due to enormous stress and cause a (n)____.
Earthquake
What theory explains hen magma rises, cools, and spreads out & creates a new crust
Sea Floor Spreading
Which of the following has the greatest direct influence on movement of the lithosphere?
Convection in Earth's Mantle
What will NOT form at a convergent boundary?
Rift Valley
What current happens in the mantle? Explain the current.
Convection Currents. Rise and sinks
Where do most geologic events, such as volcanoes and earthquakes, take place?
On plate boundaries
Explain Continental Drift and Why no one believed it?
one of the earliest ways geologists thought continents moved over time
because Alfred couldn't prove how
The Mid-Oceanic Ridge is formed at what type of plate boundary? How does the plates move?
Divergent Boundary
Apart
What happens when an oceanic plate and a continental plate collide?
The oceanic plate subducts under the continental plate
Why is the inner core solid if the outer core is liquid?
affected by the pressure from layers above it
When plates are sliding past each other, what geological event will occur?
Earthquakes