Plate Boundaries
Plates that move apart from each other
Divergent Boundary
Why scientists rejected Wegener’s hypothesis of Continental Drift
No explanation for how the plates moved
This layer of Earth is broken up into distinct plates
lithosphere
Name at least two of the three types of faults
normal, reverse, strike-slip
an idea that can be tested by further investigation, experimentation or research
hypothesis
Plates that come together
Convergent Boundary
This underwater geologic activity proved the continents drifted apart
seafloor spreading
This force is responsible for moving the continents great distances
convection
This is used to measure the seismic waves of an earthquake
Seismograph
Theory that Earth's lithosphere is divided into large plates that move and form different land forms
Theory of Plate Tectonics
Plates that slip past each other
Transform Boundary
This extinct freshwater reptile’s remains were found on Africa and South America. Evidence of Continental Drift
mesosaurus
These are the two types of crustal plates
Oceanic and Continental
Volcanoes form when plates move apart and rock rises to fill the vacant space. This mostly happens here
mid-ocean ridge
What the scientific method produces after a hypothesis has been shown to be true through a broad range of studies
theory
This occurs if one or both plates are oceanic crust
Subduction
The fossils of tropical fernlike plants were found in this arctic island. Evidence of Continental Drift
Spitsbergen
This is the type of crust that will subduct when two plates collide
oceanic it’s more dense
Why are there so many earthquakes and volcanoes located at the Ring of Fire?
oceanic/continental plates meet here
break in the earth's crust or mantle, mostly occurring along plate boundaries where stress is deforming the rock
fault
Mid Ocean Ridges are features of this type of boundary
Divergent
This is the name of the undersea mountains which oceanographers mapped that looked like the surrounding coastlines. Evidence of Continental Drift
Mid Atlantic Ridge
This is a range of how far plates move per year
1 to 10 centimeters
This type of stress squeezes rock until it bends or breaks.
compression
Where Earth's plates meet and move apart, come together or slip past each other
plate boundaries