BONUS (3 points) You want to determine the average rate of seafloor spreading for an ocean basin. You determine that the sediments at a location 254 kilometers (km) from a spreading ridge are 120 meters (m) thick and estimate that the average rate of sedimentation was 2 cm/1,000 yr.  What was the average rate of seafloor spreading in centimeters per year (cm/yr) based on the information provided? Remember that: There are 1,000 meters (m) per kilometer (km) There are 100 centimeters (cm) per meter (m) Round your answer to the nearest tenth, or 1 decimal place.

Turbidity currents are fast-flowing sluries of water and sediment that flow down slope. They can potentially carry sediments of all grain sizes. Which grain size would be the first to deposit as a turbidity current slows?

On average, which is thicker, oceanic crust or continental crust?

Why did Earth’s interior separate into the core and mantle?

A theory is an untested, educated guess used to explain observations.

Match each definition to the corresponding term.

Zooplankton that feed on phytoplankton are

Fish that are cruisers tend to  

Evaluating Risk Response Options: Avoidance, mitigation, sharing, and acceptance are all valid options that you should consider using (sometimes at the same time) to lower the risk level you face. The key is to use these options together; you want to balance risk and reward to maximize the benefits. These benefits can be financial or some other, perhaps difficult to quantify (for example, morale, partnerships, long-term strategy), benefit. 

All of the following are adaptations of deep-water nekton except