Plate Tectonics: A Scientific Revolution Unfolds > Concept #3 Quiz
lost cities of mer-people
mapping of the ocean floor
ocean crust age data
fitting of continental edges
seismic (earthquake) data
ocean crust magnetic stripe data
the Atlantic Ocean is currently widening
The current shorelines of continents have appeared the same way for only 3.5 of the 4.5 billion years of Earth's history.
Earth's magnetic fields have changed through time, making the current coastline information incorrect for Earth's history.
Exploration of the ocean floors revealed that continents extend into the ocean for some distance, and actually end at the edge of the continental shelf.
Exploration of the continents revealed that the continents are smaller than shown by their coastlines, allowing a better fit between continents.
hot spot island chains (like Hawaii)
magmatic island arcs
a. global positioning system (GPS) by satellite
c. slab-pull and ridge-push velocities
both a. and b.
all of these
reversed magnetizations along the rift valleys and normal magnetizations along the ridge
concentric circles about a rising plume of hot, mantle rocks and magma
alternating Earth magnetic fields, both normal and reversed through time
normal and reversed magnetized strips roughly perpendicular to the ridge