PBS
When a Billion Years Disappeared
In some places, the rocks below the Great Unconformity are about 1.2 billion years older than those above it. This missing chapter in Earth’s history might be linked to a fracturing supercontinent, out-of-control glaciers, and maybe the...
Associated Press
GOP witness rejects Trump conspiracy theories
Former Ukraine envoy Kurt Volker says he felt a discussion of investigations was "inappropriate" in a July meeting between Ukrainian and U.S. officials at the White House.
Crash Course
How Rivers Shape the Landscape: Crash Course Geography
Today we're going to talk about rivers and how these dynamic, delicate, yet powerful systems are able to constantly change the landscape. We'll focus on the Zambezi River in Southeast Africa following its main features from the...
Curated Video
Sedimentary rock
Rock formed by the build-up of layers of sediment over time. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...
Curated Video
Coastal Processes
A closer look at the three key processes that shape our coasts. What are they and what effects do they have? Earth Science - Geology - Learning Points. Our coastlines are constantly being re-shaped by three key processes. Erosion -...
Curated Video
Coastal Landforms
Coastal erosion produces beautiful beaches and some rather unusual land formations, from spits to stacks, mud flats to salt marshes. Earth Science - Geology - Learning Points. Cliffs are formed when destructive waves attack the bottom of...
Curated Video
Meanders and Oxbow Lakes
Meanders and oxbow lakes are found in the middle course of a river. Discover how a meander forms and how this process can lead to an oxbow lake. Earth Science - Geology - Learning Points. At its middle course, a river gathers water...
Curated Video
Depositional Features
Discover more about depositional features, such as floodplains and levees. Some of the world's largest deltas are visible from space. What are these fertile and diverse features, and how are they formed? Earth Science - Geology -...
Curated Video
Glaciers - Moving Ice Masses
Glaciers are a destructive force, moving slowly across landscapes, reshaping them as they go. Earth Science - Geology - Learning Points. Over three-quarters of Earth's fresh water is locked in frozen reservoirs, known as glaciers....
Curated Video
Erosion on the Ganges
Explore how the Ganges river dramatically sculpts the landscape in the Bay of Bengal. Material processes - Classifying materials - Soil Learning Points Water can wash away or erode soil very quickly. A Twig Context Film. Reinforce and...
Curated Video
River processes
Take a trip down the Colorado river in the Grand Canyon and wonder at the awesome power of water! People and places -Physical geography - Rivers Learning Points River processes, such as erosion, transportation and deposition, can...
Curated Video
Cambios de Estado - Materia
En la Tierra, los materiales pueden existir como sólidos, líquidos o gases y cambiar de un estado a otro al calentarse o enfriarse, alterando sus propiedades. Procesos como evaporación, condensación, fusión y sublimación describen estas...
Curated Video
द्रव्य की स्थिति के परिवर्तन | मामला | भौतिक विज्ञा | FuseSchool Hindi
यह वीडियो पदार्थ की तीन मुख्य अवस्थाओं (ठोस, तरल, गैस) और उनके बीच के संक्रमण के बारे में है। गर्मी के प्रभाव से, ठोस बर्फ पिघलकर तरल पानी में बदल जाती है, और जब तरल को गर्म किया जाता है, तो वह गैस में परिवर्तित हो जाता है। वीडियो में...
Professor Dave Explains
Methods of Dating the Earth Part 1: Relative Dating
We've learned about all the enormous time spans that describe the billions of years in Earth's history, but how did we arrive at these dates? How can we know the age of the Earth? Let's learn about some dating methods, starting with...
Curated Video
The Rock Cycle
This video will show how minerals form and how rocks form from minerals and go through different phases of the rock cycle (igneous, metamorphic, and sedimentary).
Curated Video
Landforms and Destructive Forces
Landforms and Destructive Forces looks at how landforms are the result of a combination of destructive forces such as erosion and deposition of sediment.
Weatherthings
Water Smart: The Sun, Water Cycle, & Climate - Runoff
The Sun, Water Cycle, & Climate shows us how the sun produces heat to drive the water cycle. It's made clear that the water cycle continues in the absence of sunlight or heat. We learn how the two components of climate- temperature and...
Weatherthings
Water Smart: The Sun, Water Cycle, & Climate - Precipitation
The Sun, Water Cycle, & Climate shows us how the sun produces heat to drive the water cycle. It's made clear that the water cycle continues in the absence of sunlight or heat. We learn how the two components of climate- temperature and...
Catalyst University
Major Parts of Long Bones | Compact & Spongy Bone Histology
In this video, we will discuss the major parts of long bones. Then we take a look at the histology of compact (cortical) and spongy (trabecular) bone.
Catalyst University
Physiology of the Osteoclast
In this video, we discuss the following: [1] functions of osteoclasts and how they promote bone resorption [2] production of osteoclasts from macrophages [3] appearance of osteoclasts by Scanning EM
NASA
NASA | Goddard's Detector Technology
Behind those stunning NASA images are specialized detectors developed, fabricated, and packaged here at the Goddard Space Flight Center. Tour the Detector Development Lab (DDL) and see how these first-of-a-kind detectors are created....
Catalyst University
Regulation of Blood Calcium via PTH and Calcitonin
In this video, we will contrast the biological/hormonal responses to low and high blood calcium and determine the effects on bone mineral density.
Visual Learning Systems
Forces Shaping the Earth: Summing Up
Gravity and erosion are major factors in changing the shape of the surface of Earth. The different types of erosion, and the major types of mass movements caused by gravity are discussed in this video. Other terminology includes:...
Weatherthings
Frost
We find frost often on a clear cold morning when wind is calm, and the temperature is near or below freezing. Frost is ice crystals that form from moisture in air, when the relative humidity rises to 100%. Often seen on cars and grass,...