Tag «PLivjPDlt6ApRfQqtRw7JkGCLvezGeMBB2»

Deserts 101 | National Geographic

Deserts 101 | National Geographic

– [Narrator] Wind whips over a barren wasteland. Vast nothingness as far as the eye can see, or so it may seem. Creatures peek out of burrows, scurry across the sand, and soar through the sky, revealing a landscape not as lifeless as it might first appear. Deserts are often defined as areas of land …

Sharks 101 | National Geographic

Sharks 101 | National Geographic

(ominous music) – [Narrator] They glide through the water with unmistakable grace, remnants of an ancient past, they dive and they rise from the ocean’s murky depths to it’s sun-kissed shallows, rousing fear and awe like no other creature in the sea. The world’s biggest living fish is a shark. Of the estimated 34,000 species …

Black Holes 101 | National Geographic

Black Holes 101 | National Geographic

(mysterious music) – [Woman] Black holes are among the most fascinating objects in our universe, and also the most mysterious. A black hole is a region in space where the force of gravity is so strong, not even light, the fastest known entity in our universe, can escape. The boundary of a black hole is …

Lungs 101 | National Geographic

– [Narrator] Breathe in, breathe out. With every breath, the body is replenished and cleansed. A process made possible by two of the body’s most important and delicate organs. The lungs are two major components of the respiratory system. Soft, light, and elastic, these organs are prime for taking in and filling up with air. …

Wildfires 101 | National Geographic

Wildfires 101 | National Geographic

– [Narrator] On average, wildfires burn up to five million acres of land in the United States each year. While they can start naturally, wildfires are often caused by humans with devastating consequences. Wildfires are large, uncontrolled infernos that burn and quickly spread through wild landscapes. Types of wildfires may include forest, brush, and peatland …

Heart 101 | National Geographic

– [Narrator] The heart pumps blood throughout the body. Carrying oxygen and nutrients to every cell. It’s this circulation of blood that is vital to sustaining life. The heart is an organ made up of several tough layers of muscle. The pericardium is the thin layer that covers the exterior while the endocardium lines the …

Cancer 101 | National Geographic

Cancer 101 | National Geographic

– [Narrator] Today cancer causes one in every seven deaths worldwide. But how does cancer start, and what is being done to combat it? Our bodies contain trillions of highly specialized cells and each carries genes responsible for regulating cell growth and division. But when a genetic change disrupts this process cells begin to grow …