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Showing results - 81 to 90 of 169
Life Goes On: Vertebrates: Marine and Terrestrial
04:43

Life Goes On: Vertebrates: Marine and Terrestrial

Marine biologists informally classify marine animals into two large groups: invertebrates and vertebrates. Vertebrates have backbones, while invertebrates do not. There are far more invertebrates than vertebrates in the ocean, but the vertebrates-wh...

Its in the Water: Water's Chemical Structure
04:09

Its in the Water: Water's Chemical Structure

Water's unique chemical structure gives it much higher freezing and boiling points than would otherwise be the case. This has a great deal to do with Earth being as hospitable to life as it is. That same chemical structure also gives water exception...

Its in the Water: Thermohaline Circulation
01:11

Its in the Water: Thermohaline Circulation

Thermohaline circulation is driven by differences in temperature and salinity, as opposed to circulation driven by wind. Understanding patterns of water movement may be crucial to better understanding global climate and climate change.

Its in the Water: Salinity, Density, and Temperature
03:51

Its in the Water: Salinity, Density, and Temperature

Obtaining accurate salinity measurements is vitally important because salt, along with temperature, has a significant impact on the density of seawater. And this, in turn, greatly affects ocean structure and circulation.

Its in the Water: Seawater, Freshwater and Salt
02:37

Its in the Water: Seawater, Freshwater and Salt

While both seawater and freshwater contain a wide array of minerals and other constituents, the amount of salt in seawater is generally greater than in any other large body of standing water. There are a number of ways in which salt is added to seaw...

Using Sound to Measure Ocean Warming
03:08

Using Sound to Measure Ocean Warming

Renowned oceanographer and geophysicist Walter Munk talks about efforts to measure ocean warming through the use of sound--a process known as dark acoustic thermometry. Professor Munk notes that since the speed of sound increases in the ocean with t...

Life Goes On: Fishes: Sensory Mechanisms
01:06

Life Goes On: Fishes: Sensory Mechanisms

Fishes survive in the ocean in part due to their sensory mechanisms. They utilize both sight and smell in this regard, as well as what's called a lateral line system. This is a series of pores and canals along the body and sometimes on the head that...

Using Tidal Power
01:04

Using Tidal Power

Renowned oceanographer and geophysicist Walter Munk talks about the potential use of tidal power to generate electricity. He notes that the Bay of Fundy is frequently mentioned as a possible site for this sort of power generation. According to Dr. M...

Noise Pollution and Marine Life
04:28

Noise Pollution and Marine Life

Renowned oceanographer and geophysicist Walter Munk talks about the impact of sound on marine animals. He discusses the campaign of environmental groups to cut down on noise pollution in the ocean--a campaign which Professor Munk argues resulted in ...

The Water Planet: Water: Earth's Distinguishing Characteristic
03:49

The Water Planet: Water: Earth's Distinguishing Characteristic

The third planet out from the sun, Earth is unique in many ways. But perhaps the most significant is that seventy percent of Earth's surface is covered with water.