Rivers discharge mineral-rich water to the oceans. Satellite view of La Plata River discharge to the Atlantic Ocean. One way minerals and salts are deposited into the oceans is from outflow from rivers, which drain the landscape, thus causing the oceans to be salty.

There are two type of Ocean Currents:

• Surface Currents–Surface Circulation.
• Deep Water Currents–Thermohaline Circulation.
• Primary Forces–start the water moving.
• The primary forces are:
• Secondary Forces–influence where the currents flow.
• Solar heating cause water to expand.

Underwater currents can form in lakes, rivers and oceans, and there are many reasons why they happen. Some ocean currents are very large, and the biggest one – called the “global conveyor belt” – moves water very slowly all the way around the world.

(Entry 1 of 2) : a circular or spiral motion or form especially : a giant circular oceanic surface current. gyre. verb.

Use the word gyre when you describe the spiral shape that petals make in the face of a flower. You can use the noun gyre in a variety of ways, but it always means a kind of circle, especially one that coils or spirals.

noun. a ring or circle. a circular course or motion. Oceanography. a ringlike system of ocean currents rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.

In Yeats’s “The Second Coming,” “gyre” is used to represent the swirling, turning landscape of life itself. Gyres apper in many of Yeats’s poems. He uses it to represent the systems that make up life, the push-pulls between freedom and control that spin together to create existence.

The falconer in “The Second Coming” is generally thought to represent Christ. The Christian historical epoch, or “gyre” as Yeats calls it, is drawing to a close. This is what Yeats means by “The falcon cannot hear the falconer.” The falconer also hints at Yeats’ fundamentally aristocratic understanding of politics.

There are five gyres to be exact—the North Atlantic Gyre, the South Atlantic Gyre, the North Pacific Gyre, the South Pacific Gyre, and the Indian Ocean Gyre—that have a significant impact on the ocean. The big five help drive the so-called oceanic conveyor belt that helps circulate ocean waters around the globe.

Major Themes of “The Second Coming”: Violence, prophecy, and meaninglessness are the major themes foregrounded in this poem. Yeats emphasizes that the present world is falling apart, and a new ominous reality is going to emerge.

Yet for all its metaphorical complexity, “The Second Coming” actually has a relatively simple message: it basically predicts that time is up for humanity, and that civilization as we know it is about to be undone. Yeats wrote this poem right after World War I, a global catastrophe that killed millions of people.

PART A: How does the repetition of the phrase “The Second Coming” in lines 10-11 contribute to the tone of the poem? The repetition emphasizes the speaker’s worry and contributes to the fearful tone.

According to Yeats “Spiritus Mundi”, a Latin term that literally means, ‘world spirit’, is ‘a universal memory and a ‘muse’ of sorts that provides inspiration to the poet or writer’. From ‘Spiritus Mundi,’ Yeats believed, came all poets’ inspiration.

Thermohaline circulation plays an important role in supplying heat to the polar regions. Therefore, it influences the rate of sea ice formation near the poles, which in turn affects other aspects of the climate system (such as the albedo, and thus solar heating, at high latitudes).

– If global warming shuts down the thermohaline circulation in the North Atlantic Ocean, the result could be catastrophic climate change. Between Greenland and Norway, the water cools, sinks into the deep ocean, and begins flowing back to the south.

Thermohaline circulation describes the movement of ocean currents due to differences in temperature and salinity in different regions of water. Temperature and salinity change the density of water, resulting in the water to move accordingly. Cold water is usually denser than warm water (4°C is where water is densest).

Global warming could potentially cause a thermohaline circulation shutdown and subsequent regional cooling, but because Earth will continue to warm as a result of greenhouse gas emissions, it would not produce another Ice Age.

In the ocean as a whole, salt water is on the surface – because it is hotter than water with less salt. Thus we can say that thermohaline circulation repeats in a cycle because the new water cools and sinks.

about 1,000 years

The great ocean conveyor moves water around the globe. This motion is caused by a combination of thermohaline currents (thermo = temperature; haline = salinity) in the deep ocean and wind-driven currents on the surface.

Global climate change could disrupt the global conveyer belt, causing potentially drastic temperature changes in Europe and even worldwide. This sequence of events could slow or even stop the conveyor belt, which could result in potentially drastic temperature changes in Europe.

The main part of the world ocean deep waters is formed by heat loss at high latitudes. In contrast to the thermal winter convection occurring over most of the oceans the thermohaline forcing is, in the polar areas, dominated by freezing and melting.

At high latitudes, ocean waters receive less sunlight – the poles receive only 40 percent of the heat that the equator does. Cold water is also more dense, and as a result heavier, than warm water. Colder water sinks below the warm water at the surface, which contributes to the coldness of the deep ocean.

Two major deep-water masses are North Atlantic Deep Water (NADW), formed in the North Atlantic by complex mixing of water from the Norwegian Sea, Gulf Stream, and other water masses in the North Atlantic (including Mediterranean Intermediate Water), and Antarctic Bottom Water (AABW) formed by sinking of very cold.

Deep waters are “formed” where the air temperatures are cold and where the salinity of the surface waters are relatively high. The combinations of salinity and cold temperatures make the water denser and cause it to sink to the bottom. Places where the water is cold enough and salty enough to form bottom water.

Water flowing northward becomes modified through evaporation and mixing with other water masses, leading to increased salinity. When this water reaches the North Atlantic it cools and sinks through convection, due to its decreased temperature and increased salinity resulting in increased density.

As water gets warmer, its molecules spread out, so it becomes less dense. This structure is less dense than the liquid water, so ice floats. Deep water is denser than shallow water. The water molecules are packed together more tightly because of the weight of water above pushing down.

15 feet / round

Average: 5.04 m/s (36.0 minutes based on average terminal velocity). Average: 4.70 m/s (38.7 min based on average terminal velocity).

If the buoyant force is greater than the object’s weight, the object rises to the surface and floats. If the buoyant force is less than the object’s weight, the object sinks. If the buoyant force equals the object’s weight, the object can remain suspended at its present depth.

Buoyant force is directly proportional to the density of the fluid in which an object is immersed. Buoyancy is the tendency to rise or float in a fluid. where ρ is the density, V is the volume, and m is the mass of the displaced fluid. g is the acceleration due to gravity (9.81 m·s⁻²).

Use the formula BF = Vdg where V is the volume of the object, d is the density of the water, and g is the acceleration due to gravity. Use g = 9.8 m/s^2. Subtract the weight of the sinking object from the buoyant force of water to get the net force acting on the sinking body.

If there is enough air resistance to slow down the water, then the denser than water object will fall faster than the water.

When it hits the water most of the energy in the lead will be absorb at impact then it will fall through the water being accelerated by gravity, again 32 feet per second/9.8meters per second.