Oceans and Seas

Do you think the ocean floor has valleys and mountains?

What ocean did Marie Tharp and Bruce Heezen collect depth samples from to begin drawing a map of the ocean floor? 

How did they collect the data about how deep the ocean floor was?

True or False: On the reading on the previous slide it is stated that mid-ocean ridges extend into every ocean on earth. 

True or False:  Sonar readings help us see what is underneath the waves. 

How far below sea level is the peak of this mid-ocean ridge? (measure from the front of the image)

How high from the sea floor does this mid-ocean ridge rise? (again, measure from the front of the diagram) 

How deep below the peak is the valley marking the center of the ridge?

Which features form the longest mountain ranges on earth? 

Which process adds more ocean crust to the ocean floor? (page 198) 

Does sea-floor spreading change the size of the ocean?

True or False: Sonar is a device scientists use to map the ocean floor.

True or False: The younger a rock sample is the closer it will be to the mid-ocean ridge.

True or False:

The pattern of magnetic stripes in rocks on either side of a mid-ocean ridge is the same.