Plate tectonics Crossword

The theory that a piece of earths crust moved on top of the upper mantle.
The continents that were once joined a single supercontinent which then broke into pieces that moved apart.
The continents that move slowly across earths surface in the process.
A chain of underwater mountains and extends into all of earths oceans.
The process by which new oceanic crust is created at midoceans ridges as older crust moves away.
As sea-floor spreading occurs old oceanic plates sink into the mantle in the process.
As a plate sinks through a subduction zone, it bends forming a depression in the ocean floor.
Plates that move away from eachother.
Plates come together or collide.
Plates slice past each other moving in opposite directions.
What causes the continental drift and sea floor spreading.
Who hypothesized that the continents were once joined in a single supercontinent, which then broke into pieces that moved apart.
Who proposed the theory of sea floor spreading.
What do they use to determine the ages of rock samples.
The motions of earth’s plates have been measured by.
What forms along most plate boundaries.
Large land masses thought to have divided to form the present continents.
The branch of science concerned with earthquakes and related phenomena.
A bend in layers of rock is formed where rocks are squeezed together.
A break in a mass of rock along which movement occurs.