World in Motion: Plate Boundaries and Plate Movement
Whether studying earthquakes, volcanoes, or other geologic events, scientists usually focus their attention on plate boundaries and plate movement.
Subject: ocean
Transcript: obvious one is the mid-ocean ridge system. This is the area where you have these high mountain chains, You have the lava welling up along those rifts And
World in Motion: Heat, Convection and Plate Tectonics
Most scientists believe heat and convection probably play a major role in plate tectonics. And, yet, many questions remain.
Subject: ocean
World in Motion: Earthquakes and Plate Tectonics
With the advent of plate tectonics, it's become apparent that episodes of extreme geologic upheaval--like earthquakes--are much more than simply random events.
Subject: ocean
Transcript: -- For lack of a better term-- All this pent up strain energy is suddenly released In an earthquake. When ocean crust gets old and heavy and sinks Down
World in Motion: Understanding Earth's Interior
Many scientists believe the plate tectonics process begins deep within the Earth. The challenge is to gather reliable data about an area that no one has ever actually explored--at least not directly.
Subject: ocean
Transcript: the crust, the mantle and the core. The crust is very thin. It's about up to 10 kilometers thick in the oceans, maybe, Typically, 30 or 40 in the
Living Together: Hydrothermal Vents: Life in the Extreme
Hydrothermal vents were discovered by the submersible Alvin in 1977. They are sometimes characterized as deep ocean hot springs found thousands of
Subject: ocean
Transcript: [manahan:] hydrothermal vents in the oceans exist At the interface of big tectonic plates. As these plates move they change the physical
Dirty Water: Global Climate Change and Sea Level Rise
sufficient warming were to occur at high latitudes, ice could melt in unprecedented amounts, which might affect ocean circulation in a dramatic way.
Subject: ocean
Transcript: real and serious problem, often cite sea level rise-- Ma change in the level of the oceans, Mas one reason for their concern. [michaels:] it can change
Deep Connections: Tracers
according to the locale and circumstance, tracers as a group provide a rich source of information about ocean circulation.
Subject: ocean
Transcript: A tracer is usually a property or a substance that can be used To help elucidate a process occurring in the oceans. What does that mean? Well, that
Deep Connections: Ocean Observation Systems
While tracers have proven immensely valuable as tools with which to monitor and analyze ocean circulation, the sheer size of the world ocean presents
Subject: ocean
Transcript: [narrator:] tracers have proven immensely useful as tools with which to monitor and analyze ocean circulation. but tracers alone are not enough. the
Deep Connections: Water Masses
Water masses are layers of water distinguished by a particular temperature and salinity. Understanding how water masses form and move around is critical in understanding global climate.
Subject: ocean
Transcript: One thing i was really surprised to find out in my studies Of the ocean was that it's kind of like layers of an onion, Which is, before, i thought
Deep Connections: Thermohaline Circulation
movement of ocean water, but for the circulation of the global ocean as a whole.
Subject: ocean
Transcript: vertical movement of ocean water, but for the circulation of the global ocean as a whole. Generally, the more saline the water is, the denser it is. The