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chapter 8

oceans

QuestionAnswer
Which zone does not receive any sunlight? deep zone
a feature on the ocean floor abyssal plain
refers to dissolved salt content salinity
What are two main types of resources on the seafloor? sunlight and mineral resources
What is freshwater mixed with seawater? brackish water
What are the regions of the continental plains? the continental shelf, continental slope, and continental rise
What happens to density as depth increases in oceans? It increases
How have tectonic plates affected oceans? they form new oceans and cause old oceans to disappear
How does light that is absorbed affect the temperature of the water? kinetic energy from sunlight increases the water's temperature
Why do organisms that perform photosynthesis live only in the surface zone? the surface zone receives the most sunlight
What is the depth of the surface zone? an average of 100 meters
How much sunlight does the middle zone receive? It receives some sunlight
What ocean zone extends from an average depth of 100 m to 1,000 m? the middle zone
The ________ zone extends below a depth of 1,000 m. deep
The oceans were filled during tens of thousands of years with water from ___________ and possibly ice from comets and asteroids. precipitaion
Where do mid- ocean ridges form? where tectonic plates seperate
What do oceanographers use to explore the seafloor? submersibles
Water from a sea or an ocean that has an average salinity of 35 ppt _______. seawater
What forms where tectonic plates collide? trenches
As depth increases temperature ___________. decreases
What is the approximate temperature of water below a depth of 1,000 m? 4 degrees C
How much sunlight does the deep zone receive? no sunlight
Is the salinity of seawater constant? No
What are the five oceans? the Arctic, the Pacific, the Atlantic, the Indian, and the Southern Ocean
What covers the abyssal plains? thick layers of sediment
Created by: mcclejon5143
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