Science Chapter 17: Plate Tectonics; Grade 8
Magnetic reversal
A change in Earth's magnetic field is called a(n) ______.
Rift valley
A long, narrow, fault-bounded, continental depression is a(n) _______.
Isochron
A map line connecting points that have the same age is a(n) _______.
Magnometer
A(n) _______ detects small changes in Earth's magnetic field.
Younger
Compared to ocean crust near deep-sea trenches, crust near ocean ridges is
Wegener couldn't explain how or why the continents moved.
Continental drift wasn't widely accepted when it was first proposed because
Pangaea
Earth's continents were once joined as a single landmass called ______.
Matching coastlines
Many early mapmakers thought Earth's continents had moved based on
Paleomagnetism
The study of Earth's magnetic record is known as ________.
Divergent boundaries
Places where plates move apart are ______.
Convergent boundaries
Plates come together at ______.
Theory of plate tectonics
The ________ states that Earth's crust and rigid upper mantle are broken into enormous slabs called plates that move slowly over Earth's surface.
A mirror image of that of the other side
The magnetic pattern of ocean-floor rocks on ome side of an ocean ridge is
Seafloor spreading
The theory of ______ explains how new ocean crust is created at ocean ridges and destroyed in deep-sea trenches.
Convection
The transfer of thermal energy by the movement of heated matter is ______.
Continental drift
Wegener's hypothesis of ________ stated that Earth's continents had once been joined as a single landmass.
Subduction
______ occurs when one tectonic plate descends beneath another.
Ridge push
_______ is a process whereby the weight of an uplifted ocean ridge pushes an oceanic plate toward a subduction zone.
Transform boundaries
________ are places where plates slide horizontally past each other.