Sunday, January 22, 2023

Earth Revealed

Full megabundle coming February 2023
It seems there was a wee Golden Age of college telecourses that preceded the explosive dawn of the World Wide Web. In physics, we had The Mechanical Universe. In chemistry, there was The World of Chemistry, and in geology, there was Earth Revealed. They had been preceded by more multidisciplinary documentary series such as Jacob Bronowski's The Ascent of Man, James Burke's Connections, and Carl Sagan's Cosmos.

These telecourses ran 26 half-hour episodes, and were intended to be fairly comprehensive. The Mechanical Universe actually got a second season, for a total of 52 episodes. If there are programs with matching ambition produced in The Age of Search (21st century), I am unaware of them. Chemistry: Challenges and Solutions (2014) does a great job, but tells its story in 13 episodes.

The Buggles proclaimed that Video Killed the Radio Star in the first song played by the VJs of MTV. Did the web kill broadcast college telecourses? My guess is that the web allowed colleges to conduct their own telecourses, albeit less slickly produced, so that demand for these more broadly-targeted telecourses went extinct.

In any case, I am in the midst of crafting question sets to accompany each episode of Earth Revealed. I'll update this post as progress continues.

EARTH REVEALED at TPT [Complete series megabundle coming February 2023]

Earth Revealed shows the physical processes and human activities that shape

our planet. From earthquakes and volcanoes to the creation of sea-floor crusts and shifting river courses, Earth Revealed offers stunning visuals that explain plate tectonics and other geologic concepts and principles. Follow geologists in the field as they explore the primal forces of the Earth. This series can also be used as a resource for teacher professional development.


MODULE I: INTRODUCTION at TPT

1. Down to Earth

Surface conditions of the planets Venus and Mars are compared with those of Earth, and scenes of Earth's living landscapes lead into a discussion of how unique Earth truly is. Major topics addressed in the series, including plate tectonics, natural resources, seismology, and erosion, are introduced in this program.


2. The Restless Planet

Early Greek astronomers believed that Earth was the center of the universe. However, this notion changed dramatically over time, especially after the invention of the telescope. This program traces the development of astronomical theory with discussions of the discoveries of Copernicus, Galileo, Kepler, and Newton. Unique characteristics of Earth are also discussed.


MODULE II: PLATE TECTONICS at TPT

3. Earth’s Interior 

Oil wells do more than just produce oil — they serve as windows to Earth's interior. This program introduces the topic of geophysics, exploring methods of studying what lies beneath Earth's surface. Geophysicists use seismic wave studies, variations in temperature, magnetic fields, gravity, and computer simulations to create models of deep structures.


4. The Sea Floor

The mysteries of the ocean floor lie hidden under enormous pressure and total darkness. This program looks at the research submersibles and indirect methods used to study the bottom of the sea, providing a glimpse of volcanic activity, formations such as the continental shelf and mid-ocean ridges, and life forms that thrive at extreme depths.


5. The Birth of a Theory 

In the 1960s, earth scientists developed the theory of plate tectonics. This program traces the development of plate tectonics, beginning with the contributions and methods of geologist Alfred Wegener. Sea-floor spreading, continental drift, paleomagnetism, and the primordial supercontinent Pangaea are some of the topics covered.


6. Plate Dynamics

This program examines the movement and interaction of tectonic plates, which account for a vast array of geologic formations and phenomena — from California's San Andreas Fault to the Rift Valley of eastern Africa. The program covers convergent boundaries, subduction, hotspots, and the debate over what drives plate motion.


7. Mountain Building

This program erodes the myth of the mountain as a solid, permanent structure. Animations are used to illustrate the process of orogeny (mountain building) through accretion and erosion, as well as the role of plate tectonics, the rock cycle, and how different types of rock are formed in the course of mountain building.


8. Earth’s Structures

A visit to the Grand Canyon lays the foundation for this exploration of rock layers and deformation. The program covers sedimentation, major structures, the methods used to examine them, and how petroleum may be trapped inside them. It also looks at tectonic force and the different types of stress involved in the formation of geologic structures.


9. Earthquakes 

Showing actual footage of earthquakes and their aftermath, this program discusses the forces that fuel these massive events. Faults, waves, and the transfer of energy from the epicenter are explained, and histories of the seismograph and Richter scale are presented. The program also describes devices being developed to study—and eventually predict—earthquakes.


MODULE III: GEOLOGIC TIME AND LIFE at TPT

10. Geologic Time

To illustrate the immensity of geologic time, the entire span of Earth's existence is compressed down to a year. The timeline of major geologic events is superimposed onto the year for a condensed view of Earth's evolution. A relationship between this timeline and that of life on Earth is established, with fossils and radiocarbon dating playing a major role in the discovery.


11. Evolution Through Time

The fossil record reveals much about the diversity and development of species. This program examines the traces left by early plants, animals, and single-celled organisms and follows the progression of life forms over time. Connections are drawn between atmospheric gases, climate change, rock formation, biological functions, and mass extinctions.


MODULE IV: THE ROCK CYCLE at TPT in progress!

12. Minerals: The Materials of Earth

Minerals have been indispensable to human civilization. This program looks at the variety of minerals, their atomic and crystalline structures, and their physical properties such as hardness and luster. Petrologists' methods of sectioning rocks are shown, and gems, precious metals, ore excavation, and the value of silicates are discussed.


13. Volcanism

Volcanoes provide clues about what is going on inside Earth. Animations illustrate volcanic processes and how plate boundaries are related to volcanism. The program also surveys the various types of eruptions, craters, cones and vents, lava domes, magma, and volcanic rock. The 1980 eruption of Mount St. Helens serves as one example.


14. Intrusive Igneous Rocks

Most magma does not extrude onto Earth's surface but cools slowly deep inside Earth. This magma seeps into crevices in existing rock to form intrusive igneous rocks. Experts provide a graphic illustration of this process and explain the types and textures of rocks such as granite, obsidian, and quartz. Once again, plate tectonics is shown to be involved in the process.


15. Weathering and Soils

The Cleopatra's Needle obelisk in New York City's Central Park is severely weathered after only 75 years, whereas the dry climate of Egypt has preserved similar structures in that country for millennia. This program shows how weather, climate, chemicals, temperature, and type of substrate factor into rock and soil erosion. Environmental connections are also considered.


16. Mass Wasting

Anyone undertaking a building project must understand mass wasting—the downslope movement of earth under the influence of gravity. Various factors in mass wasting, including the rock's effective strength and pore spaces, are discussed, as are different types of mass wasting such as creep, slump, and landslides. Images of an actual landslide illustrate the phenomenon.


17. Sedimentary Rocks: The Key to Past Environments

This program returns to the Grand Canyon: its exposed layers of sedimentary rock allow scientists to peer into the geologic past. The movement of sediment and its deposition are covered, and the processes of lithification, compaction, and cementation that produce sedimentary rocks are explained. Organic components of rock are also discussed.


18. Metamorphic Rocks

The weight of a mountain creates enough pressure to recrystallize rock, thus creating metamorphic rocks. This program outlines the recrystallization process and the types of rock it can create—from claystone and slate to schist and garnet-bearing gneiss. The relationship of metamorphic rock to plate tectonics is also covered.


MODULE V: CARVING THE LANDSCAPE at TPT coming soon!

19. Running Water I: Rivers, Erosion and Deposition 

Rivers are the most common land feature on Earth and play a vital role in the sculpting of land. This program shows landscapes formed by rivers, the various types of rivers, the basic parts of a river, and how characteristics of rivers — their slope, channel, and discharge — erode and build the surrounding terrain. Aspects of flooding are also discussed.


20. Running Water II: Landscape Evolution 

The Colorado River is a powerful geologic agent — powerful enough to have carved the Grand Canyon. This program focuses on how such carving takes place over time, looking at erosion and deposition processes as they relate to river characteristics and type of rock. The evolution of rivers is covered, along with efforts to prevent harmful consequences to humans.


21. Groundwater 

Approximately three-quarters of Earth's surface is covered by water. But most fresh water comes from underground. Topics of this program include aquifers, rock porosity and permeability, artesian wells, the water table, cave formation, sinkholes, and how groundwater may become contaminated.


22. Wind, Dust and Deserts 

Land in arid climates is shaped in particular ways. This program shows how deserts are defined by infrequent precipitation and how desertification relates to proximity to the equator, proximity to mountains, and ultimately plate tectonics. Images of landscapes illustrate how wind creates features such as dunes, playas, blow-outs, and even oases.


23. Glaciers 

Many of the world's most beautiful landscapes were made by glaciers. This program shows how, explaining glacial formation, structure, movement, and methods of gouging and accumulating earth. The program provides images of glaciers and glacial landforms such as moraines, and discusses how study of glaciers may help us understand ice ages and the greenhouse effect.


24. Waves, Beaches and Coasts

This program shows the dynamic interaction of two geologic agents: rocky landmasses and the energy of the ocean. Aspects of waves — their types, parts, movement, and impact on the shore — are illustrated. The program also covers shoreline characteristics, currents, sea barriers, tides, and how the greenhouse effect could impact sea level and coastal lands.


MODULE VI: LIVING WITH EARTH at TPT coming soon!

25. Living With Earth, Part I 

Scenes of San Francisco before the Loma Prieta earthquake introduce this program addressing how humans are learning to cope with earthquakes. Various groups and agencies are studying the San Andreas Fault and the damage caused along its path to better understand how earthquakes ravage the land. Methods of studying earthquakes are reviewed.


26. Living With Earth, Part II

Since the nineteenth century, humans have turned to the Earth for energy sources to fuel their industry. This program discusses where oil comes from, how it is extracted, and how it is converted into energy. The effects of oil drilling and the burning of fossil fuels are also addressed, and the potential of alternative energy sources is considered.

No comments:

Post a Comment