What Are Tundras? | National Geographic

less than 1m read

·Nov 11, 2024

What are tundras? Tundras are among the Earth's coldest and harshest biomes. These ecosystems are treeless regions with extreme cold and low rainfall.

There are two different types of tundras: alpine and arctic. Alpine tundras occur on mountains where trees cannot grow in the high altitudes. There, the growing season is about 180 days. Mountain goats, sheep, marmots, and birds feed on low-lying plants and insects.

Arctic tundra extends from the edge of the Arctic Ocean down to the coniferous forest of the taiga. Permafrost prevents trees from taking root, but shrubs and other vegetation grow during the short summers, which range from 50 to 60 days. A variety of wildlife, including arctic foxes, polar bears, and caribou, live in the arctic tundra.

Global warming is changing the arctic tundra, and the changing tundra is contributing to global warming. The Arctic's permafrost is deteriorating, which alters not only the landscape but also the plants and animals that can live there.

In addition, permafrost contains about 14% of the Earth's carbon, so as it melts, that carbon is released into the atmosphere, contributing to global warming.

Job Security in an Insecure Time | America Inside Out

Dopamine Detox: Become Invincible

View All

Irregular plural nouns | foreign plurals | The parts of speech | Grammar | Khan Academy

Hello Garans. Today we’re talking about another kind of irregular plural noun, and that is the foreign plural. Those are words that are borrowed into English from some other language, words like fungus, or cactus, or thesis, or criteria. These words come …

Mixed number addition with regrouping

Let’s see if we can add five and two-fifths to three and four-fifths. Pause this video and see if you can figure out what this is. All right, now let’s do this together. We’ve had a little bit of practice adding mixed numbers in the past, and so one way …

Infiltrating the Illegal Wildlife Trade: A Trafficker’s Downfall | Nat Geo Live

Anson Wong is a wildlife trafficker. He’s also a guy who was trafficking at the time all the things we care about when we think about precious wildlife. He was offering snow leopard pelts, rhino horn, and he was moving live elephants. He had a tiger farm …

Radical functions differentiation | Derivative rules | AP Calculus AB | Khan Academy

Let’s see if we can take the derivative with respect to (x) of the fourth root of (x^3 + 4x^2 + 7). At first, you might say, “All right, how do I take the derivative of a fourth root of something?” It looks like I have a composite function; I’m taking the…

The Evolution of Ancient Egypt's Pyramids | Lost Treasures of Egypt

NARRATOR: The West Bank of the River Nile, home to the world’s most iconic monuments, the mighty pyramids of Giza. The pyramids once housed the bodies of the pharaohs. But though ancient Egyptian civilization lasted for nearly 3,000 years, its kings only …

Relationships between scientific ideas in a text | Reading | Khan Academy

Hello readers, this is Professor Mario Molina, a scientist who won the Nobel Prize for Chemistry. Now, I’m going to use the example of Professor Molina to teach us about connections, or drawing connections between scientific information in a text, in a pi…

What Are Tundras? | National Geographic

More Articles