Our Oceans. Essential Questions: What have we learned about the oceans over the course of Earth’s history? How do we find and access information in print and online using the card catalog?.
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What have we learned about the oceans over the course of Earth’s history?
How do we find and access information in print and online using the card catalog?
There's nothing wrong with enjoying looking at the surface of the ocean itself, except that when you finally see what goes on underwater, you realize that you've been missing the whole point of the ocean. Staying on the surface all the time is like going to the circus and staring at the outside of the tent.”― Dave Barry
Our Oceans – Composition and Behavior
What is Dave Barry saying about life in general?
Identify the simile – using “like” or “as”
The oceans are a very large mass of salt water that covers most of the earth. They cover 70% of the globe but we know little about them compared to the land masses. With all the technology that we have, amazingly 95% of Earth’s oceans remains unexplored.
With the use of these vehicles man has been able to go as deep as a little over 10,000 meters to discover things about the ocean. HOV’s carry scientists themselves to the deep sea to see firsthand what’s there.
Mariana Trench, Pacific 35,827 ft Puerto Rico Trench, Atlantic 30,246 ft Java Trench, Indian 24,460 ft Arctic Basin, Arctic 18,456 ft Southern Ocean, 23,737 ft
How far down in miles is the Challenger Deep?
Then in March , 2012, James Cameron, a Canadian film-director and deep sea explorer, was the first human to descend to a depth of 6.8 miles, by taking a solo journey to the Mariana Trench.
Oceanographers use ocean floor sediments to answer questions about the organisms in them, about the currents that carried them, about climate changes over time, and about the formation of the ocean crust.
Current, the movement of the water, is influenced by three things: tides, winds, and differences in density.
The water at the ocean surface is moved primarily by winds that blow in certain patterns because of the Earth’s spin.
Tides move the water below the surface of the oceans.
A third factor that drives currents is thermohaline circulation - a process driven by density differences in water due to temperature (thermo) and salinity (haline) in different parts of the ocean.
The Ocean’s Currents
“The water of the ocean surface moves in a regular pattern called surface ocean currents. The currents are named. In this map, warm currents are shown in red and cold currents are shown in blue.”
Marine navigation charts historically were often produced by a country's Navy and possibly also civil defense bodies and/or port management authorities
In the United States today, NOAA hydrographic survey ships scan the seafloor to identify navigational hazards and obstructions while also acquiring water depth data, in order to create accurate and up-to-date nautical charts.
Reading a Nautical Chart