
Oceanography: Exploring Earth's Final Wilderness
The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்
விதிமுறைகள் பொருந்தும்
எப்பிசோடுகள்
சீ1 எ1 - Diving In—The Ocean Adventure
18 டிசம்பர், 202431நிமிBegin your study of the ocean from every angle, examining Earth's watery realm in light of geology, biology, chemistry, meteorology, and other fields. In this lecture, survey the extent of the ocean and the approaches that oceanographers take to understanding it.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ2 - Explorers, Navigators, Pioneering Scientists
18 டிசம்பர், 202433நிமிThe early explorers of the ocean were interested in charting its islands, dimensions, and resources—and in using it as a highway for trade. Relive the exploits of these mariners, who included Europeans, Chinese, and Polynesians. Only later did scientific exploration of the ocean begin.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ3 - Ocean Basics and Ocean Basins
18 டிசம்பர், 202432நிமிAs recently as the 1950s, geologists envisioned the ocean basins as a submerged version of the continents. Explore the topography of the seabed, discovering that it is shaped by geological forces fundamentally different from those on land.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ4 - Mapping the Sea—Soundings to Satellites
18 டிசம்பர், 202434நிமிThe ocean floor was once as mysterious as the surface of another planet. Investigate the technologies involved in measuring bathymetry, the undersea counterpart of topography. Weighted ropes and cables for gauging the depth of the sea have given way to sophisticated sonar from ships and radar from satellites.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ5 - Habitats—Sunlit Shelves to the Dark Abyss
18 டிசம்பர், 202432நிமிTake a tour of organisms that live from the shallows to the ocean floor. Learn how to classify ocean zones, and discover the importance of temperature, chemistry, nutrients, light, and other factors for different life forms—from active swimmers to passive floaters and bottom dwellers.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ6 - The Spreading Sea Floor and Mid-Ocean Ridges
18 டிசம்பர், 202433நிமிWhat made the ocean floor the way it is? Trace the evidence that ocean basins are geologically young and that new oceanic crust is being continually formed at mid-ocean ridges, pushing and rifting continental plates in a process called plate tectonics.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ7 - The Plunging Sea Floor and Deep-Sea Trenches
18 டிசம்பர், 202432நிமிInvestigate subduction zones, where oceanic crust plunges beneath an overriding tectonic plate. These margins are associated with deep-sea trenches, earthquakes, tsunamis, and volcanoes. Examine other features, such as hotspots, which are a mid-plate phenomenon that includes the Hawaiian Islands chain.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ8 - The Formation of the Earth and Its Ocean
18 டிசம்பர், 202430நிமிCover 9 billion years of cosmic history—from the big bang, to the accretion of the sun and planets, to the formation of Earth's oceans 4 billion years ago. The water in the oceans came from water vapor in volcanic eruptions and possibly from comet impacts.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ9 - The Early Ocean and the Origins of Life
18 டிசம்பர், 202434நிமிExplore scenarios for the origin of life, which may have begun around deep-sea hot springs. The oceans have maintained roughly the same conditions over the entire history of life on Earth, even though the sea floor has renewed itself many times over through plate tectonics.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ10 - Marine Sediments—Archives of the Ocean
18 டிசம்பர், 202431நிமிOcean sediments are like tree rings that can be "read" as a history of the ocean and climate through time. Investigate the different sources of sediments, which range from products of erosion on land, to the remains of sea creatures, to ejecta from asteroid impacts.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ11 - Offshore Oil and Gas—Resources and Risks
18 டிசம்பர், 202434நிமிLearn the origin of petroleum and natural gas deposits, which formed under very specific conditions in marine sediments. As an example of the challenges of oil recovery, survey the technology of deep-water drilling, focusing on the disastrous blow-out in the Gulf of Mexico in 2010.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ12 - The Enduring Chemistry of Seawater
18 டிசம்பர், 202430நிமிWhy is the sea salty? Why isn't it getting saltier? Probe these and other mysteries of ocean chemistry, looking at the remarkable stability and uniformity of seawater over time. Also study the role of water and the conjectured role of life in driving plate tectonics.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ13 - How the Physics of Water Controls the Ocean
18 டிசம்பர், 202432நிமிAnalyze the surprising properties that keep the ocean liquid and make water the defining physical substance for life. Among them is its ability to retain heat, which has kept Earth in a narrow temperature range hospitable to life for billions of years. Also investigate the propagation of light in water and why the ocean is blue.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ14 - Waves—Motion in the Ocean
18 டிசம்பர், 202430நிமிChart the dynamics of wind-generated waves, which include almost all ocean waves. See how they form, grow in size, travel for thousands of miles, and then break on shore. The big waves preferred by surfers come from remote regions that have the ocean's stormiest weather.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ15 - Rogue Waves and Tsunami
18 டிசம்பர், 202432நிமிLong considered a mariners' tall tale, abnormally high "rogue" waves are now well documented. Understand the physics of why they form and the yearly toll they take on shipping. Then study tsunami, or seismic sea waves, which are generated when undersea earthquakes displace huge volumes of water, often with catastrophic results.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ16 - Tides in Theory and Practice
18 டிசம்பர், 202430நிமிTides are caused by the gravitational attraction of the moon and, to a lesser extent, the sun. Learn that the timing and height of tides are far more complex than the daily motions of the moon and sun suggest—due to the influences of coastal features, the Coriolis effect, and other factors.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ17 - Marine Life, Energy, and Food Webs
18 டிசம்பர், 202434நிமிTrace the path of energy and food through oceanic ecosystems, which have a far higher turnover of biomass than the terrestrial equivalents. As a result, most of what grows in the oceans is very quickly consumed. Learn why warm, temperate seas are often nutrient-poor compared with polar waters.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ18 - Tiny Plankton—The Most Abundant Life on Earth
18 டிசம்பர், 202431நிமிSurvey some of the many species of plankton, which are passive, floating, and drifting organisms. Microscopic plankton are ubiquitous throughout the oceans and represent all three of the basic biological domains: Archaea, Bacteria, and Eukarya.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ19 - Soft-Bodied Life in the Dark, Open Depths
18 டிசம்பர், 202433நிமிInvestigate the soft-bodied organisms that live at great depths and have no skeletons or shells. Little known until recently, this group includes a variety of creatures whose amorphous bodies are often destroyed by nets and who only came to light through studies from submersibles.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ20 - Swimming—The Many Fish in the Sea
18 டிசம்பர், 202434நிமிContrasting with free-floating plankton, nekton are the ocean's swimmers. In this lecture, study the most numerous nekton—fish—focusing on their streamlining, gills, schooling, and other adaptations. Also, examine mollusks, including the octopus, squid, and nautilus.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ21 - Marine Birds, Reptiles, and Mammals
18 டிசம்பர், 202434நிமிTurn to the nekton among birds, reptiles, and mammals. These feature some of the most magnificent creatures on the planet, including albatrosses, Sooty Shearwaters, sea turtles, manatees, seals, sea lions, whales, and dolphins. Focus on the adaptations that allow them to thrive in marine environments.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ22 - Whaling, Fisheries, and Farming the Ocean
18 டிசம்பர், 202434நிமிExamine the economic exploitation of marine life, beginning with the history of whaling and continuing to the present, when fishing is the only significant source of hunted food. Weigh the alternatives of commercial fishing and mariculture in an era of rapidly declining fish populations.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ23 - Where Sea Meets the Land and Why Coasts Vary
18 டிசம்பர், 202432நிமிHave you ever walked along a beach or stood on a high cliff overlooking the sea and wondered how the land got to be that way? Learn how erosion, deposition, sea-level change, plate tectonics, and other factors have produced the characteristic coastlines of the world.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ24 - Where Rivers Meet the Sea—Estuaries and Deltas
18 டிசம்பர், 202430நிமிRiver mouths, deltas, tidal inlets, fjords, and enclosed bays are places where freshwater and seawater mix. Explore these complex zones, which are among the most biologically productive ecosystems on Earth. Many marine organisms carry out key parts of their lifecycles in such environments.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்சீ1 எ25 - Coastal Erosion—Beaches and Sea Cliffs
18 டிசம்பர், 202431நிமிCoastlines are constantly changing features. Examine what happens when structures are built to halt or reverse the change, especially at a time when sea level is rising. Most human-engineered solutions turn out to be short-term at best, and many have unintended consequences.The Great Courses Signature Collection அல்லது The Great Courses Signature Collection & Living-க்குச் சந்தா செலுத்துங்கள் அல்லது வாங்குங்கள்