Full Act of Act Essay

Density Currents
Deep in the ocean, waters circulate not because of wind but because of density differences. A density current forms when a mass of seawater becomes more dense than the surrounding water. Gravity causes more dense seawater to sink beneath less dense seawater. This deep, dense water then slowly spreads to the rest of the ocean.
The density of seawater can be increased if salinity increases, as you can see if you perform the MiniLAB on this page. It also can be increased by a decrease in temperature. In the Explore Activity, the cold water was more dense than the warm water in the beaker. The cold water sank to the bottom. This created a density current that moved the food coloring.
Changes in temperature and salinity work together to create density currents. Density currents circulate ocean water slowly - moving as little as a few meters per month.
Deep Waters
An important density current begins in Antarctica where the most dense ocean water forms during the winter. As ice forms, seawater freezes, but the salt is left behind in the unfrozen water. This extra salt increases the salinity and, therefore, the density of the ocean water until it is very dense. This dense water sinks and slowly spreads along the ocean bottom toward the equator, forming a density current. In the Pacific Ocean, this water could take 1000 years to reach the equator.

电流密度

在海洋深处，海水循环，不是因为风，但由于密度差异。当一个密度大的海水变得比周围的水密度电流的形式。引力导致更多的密集海水沉入海水密度变小。这种深，浓水再慢慢扩散到其余的海洋。

海水的密度可以增加，如果盐分增加，你可以看到，如果您执行此页面上的彩扩。它也可提高在降温。在探索活动中，冷水比烧杯中的温水密集。冷水沉到水底。这造成了电流密度动议的食用色素。

在温度和盐度的变化，创造共同的电流密度。电流密度循环海水缓慢- 只要每月数米的小感动。

深水
一个重要的密度电流开始在南极海洋最密集的地方，冬季水形成。由于冰的形式，海水结冰，但盐是留在未冻水。这种额外增加了盐度和盐，因此，海洋水的密度，直到它是非常密集。这一密度大的海水下沉，慢慢地沿着传播向赤道海洋底部形成了异重流。在太平洋，这种水可能以1000年达到赤道。

In the North Atlantic Ocean, cold, dense water forms around Norway, Greenland, and Labrador. These waters sink, forming North Atlantic Deep Water. In about the northern on third to one half of the Atlantic Ocean, North Atlantic Deep Water forms the bottom layer of ocean water. In the southern part of the Atlantic Ocean, it flows at depths of about 3000 m, just above the denser water formed near Antarctica. The dense waters circulate more quickly in the Atlantic Ocean than in the Pacific Ocean. In the Atlantic, a density current could circulate in 275 years.
Intermediate Waters
A density current also occurs in the Mediterranean Sea, a nearly enclosed body of water. The warm temperatures and dry air in the region cause large amounts of water to evaporate from the surface of the sea. This evaporation increases the salinity and density of the water. This dense water from the Mediterranean flows through the narrow Straits of Gibraltar into the Atlantic Ocean at a depth of about 320 m. When it reaches the Atlantic, it flows to depths of 1000 m to 2000 m because it is more dense than the water in the upper parts of the North Atlantic Ocean. However, the water from the Mediterranean is less dense than the very cold, salty water flowing from the North Atlantic Ocean around Greenland, Norway, and Labrador. Therefore, as shown in Figure 10, the Mediterranean water forms a middle layer of water - the Mediterranean Intermediate Water.

在北大西洋，冷，周围挪威，格陵兰岛和拉布拉多浓水的形式。这些水域沉没，形成北大西洋深层水。在谈到对第三北部一个大西洋的一半，北大西洋深层水形成的海水底层。在大西洋南部的一部分，它流在约3000米深处，上面南极洲附近形成了密集的水。稠密的水散发大西洋之快，超过了太平洋。在大西洋，电流密度分发275年。

中间水域

阿密度电流也发生在地中海，近封闭的水体。温暖的温度和干燥的空气在该地区造成大量水分蒸发从海面。这增加了蒸发水的含盐量和密度。这从地中海浓水流量约320直布罗陀通过深入到狭窄的海峡大西洋米当它到达大西洋，它流向1000米至2000米深处，因为它比在北大西洋的上部的密度小于水。然而，从地中海水小于很冷，咸从北大西洋周围格陵兰，挪威和拉布拉多流水密集。因此，如图10所示，地中海水形成的水中间层 - 地中海中层水。

Tides
When you go to a beach, you probably notice the level of the sea rise and fall during the day. This rise and fall in sea level is called a tide. A tide is caused by a giant wave produced by the gravitational pull of the Sun and the Moon. This wave has a wave height of only 1 m and 2 m, but it has a

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