Plate tectonics Crossword

200 million years ago this existed
Crust closer to a mid-ocean ridge moves away from the ridge and toward a deep ocean trench
The lady who found that the ocean floor looked like the seams of a baseball
A device that uses sound lengths to measure the distance to an object
Renewed about every 200 million years
Earths lithosphere solid outer shell
Plates that move apart
Plates that slip past each other
Plates that come together
One theory put together by geologists
Breaks in the Earth's crust where rocks have slipped past each other
Where pieces of crust diverge on land
A major earthquake that took place in California in 1857 and 1906
A mountain chain that runs for 8,900 kilometers
Rock on the ocean floor creates this
Wegener's idea that the continents slowly moved over Earth's surface
An ancient organism that has been preserved in rock
Forms long chains of mountains that rise up from the ocean floor
Adds more crust to the ocean floor
The oceanic crust bends downward