1.
Mineral-rich water, heated by newly formed oceanic crust, escapes through cracks in the ocean floor called _____.


A. nodules


B. hydro thermal trenches


C. hydro thermal vents


D. rifts

2.
Which is not a drawback to obtaining energy resources from the ocean floor?


A. oil spills


B. breakdown of gas hydrates at the surface


C. trace amounts of resources


D. effects on marine habitats

3.
The topography of the ocean floor _____.


A. is uniformly hilly


B. is as diverse as that of the continents


C. is smooth and flat


D. cannot be mapped like the continents

4.
A submersible is used to _____.


A. measure sound waves in even back-and-forth patterns


B. conduct deep-sea research


C. transport cargo to ships


D. attract water toward elevated areas on the ocean floor

5.
Which forms at mid-ocean ridges?


A. island arcs


B.deep-sea trenches


C. guyots


D. new ocean floor