When comparing fresh water and saltwater, this one is more dense.
What is saltwater?
100
Surface currents are caused by this.
What is wind blowing across the ocean's surface?
100
The intertidal zone is located above this landform.
What is the continental shelf?
100
This is the area where the tides wash up on the shoreline. Organisms living here are exposed to changing temperatures, salinity, and moisture.
What is the intertidal zone?
100
Exploring the deep zone is a challenge because of __.
What is increased pressure?
200
When temperatures drop below freezing and the size of icebergs and glaciers increase, this happens to the salinity of the surrounding water.
What is an increase in salinity?
200
When cold water rises from the ocean bottom bringing up nutrients and increasing the number of organisms in the neritic zone.
What is an upwelling?
200
This drop-off marks the end of the neritic zone.
What is the continental slope?
200
In the open ocean, this zone contains water with the least amount of pressure.
What is the surface zone?
200
This uses reflected sound waves to measure distances.
What is sonar?
300
These organisms produce the majority of our planet's oxygen. (even more than our forests or grasslands)
What is phytoplankton?
300
When the trade winds are weak blowing across the Pacific ocean and the warm water builds up along the western coastline of N. & S. America. This supresses the coastal upwellings and creates an abnormal weather pattern.
What is El Nino?
300
At the mid-ocean ridges, hot gases escape from the rising magma creating these.
What are hydrothermal vents?
300
In an estuary, this is the greatest challenge to organisms living in this environment.
What is changing salinity?
300
These underwater vehicles are used to carry scientists deep into the ocean. They are designed to withstand increased pressure.
What is a submersible?
400
This gas is 60 times more plentiful in the oceans than in the atmosphere. It is used by plants for photosynthesis and by coral to build their hard skeletons.
What is Carbon Dioxide?
400
This is how an upwelling is formed.
What is wind pushing warm water away from the shoreline?
400
Because these are the lowest points of the ocean floor, the greatest pressures of ocean water would be found here.
What are trenches?
400
In the depths of the ocean, sunlight can not penetrate and it is called the aphotic zone. Because of this, the food web is based on __ .
What is chemosynthesis?
400
As you decend down to the ocean floor, you pass across this broad flat region of thick mud and silt formed from the sunken decay of the ocean.
What is the abyssal plain
500
In an upwelling, animal life is more plentiful because of the increased nutrients for the plants, but also because of the increase in DO. Why does an upwelling have more DO?
What is because cold water holds more dissolved oxygen (DO)?
500
These are caused by density differences. (Variations in temperature and/or salinity).
What are deep currents
500
New oceanic crust is created at this landform.
What is the mid-ocean ridge
500
Mangrove forest are located in this environment.
What is warm, sandy, shallow coastlines (Estuary)?
500
SCUBA stands for ?????
What is self-contained underwater breathing apparatus?