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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.

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Earth's Polar Regions

Do you wonder what Earth's Polar Regions are like? Where do polar bears live? Where do penguins swim? Why does the Sun never shine in winter in the Arctic? Why does aurora occur near the Earth’s Poles? How big are the Earth’s ice caps, and are they changing? The Earth’s Polar Regions are hosts to unique phenomena and ecosystems – both fascinating and beautiful. Explore the Earth’s Arctic and Antarctic through the links in this section.

A group of
Emperor penguins wait their turn to dive into the ocean near <a
href="/people/postcards/jean_pennycook_11_29_0.html&edu=elem">Ross
Island, Antarctica</a>
on November 3, 2004.
Emperor penguins routinely dive to 500 meters in
search of food. Scientists are interested in understanding how they can
endure the stress of these dives in such an <a
href="/earth/extreme_environments.html&edu=elem">extreme
environment</a>.<p><small><em> Image courtesy of Emily Stone, National Science Foundation</em></small></p>

A sinuous glowing band of <a
href="/earth/Magnetosphere/aurora.html&edu=elem">aurora</a> (the Aurora Australis
or Southern Lights) loops around the <a
href="/earth/polar/polar_south.html&edu=elem">southern polar</a>
region in the
distance as viewed by astronauts onboard the space shuttle on <a
href="http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/archives/sts-39.html">STS-039</a>.
<a
href="/earth/Magnetosphere/aurora/aurora_colors.html&edu=elem">Aurora are produced</a>
when <a
href="/physical_science/physics/atom_particle/particle_radiation.html&edu=elem">energetic particles</a>
entering the Earth's
atmosphere from space interact with <a
href="/physical_science/physics/atom_particle/atom.html&edu=elem">atoms</a> and <a
href="/earth/geology/molecule.html&edu=elem">molecules</a> in the atmosphere and
release energy, emitted as light. <p><small><em>Courtesy of NASA, Astronaut Overmeyer and Dr. Hallinan</em></small></p>

Roaming across Arctic <a
href="/earth/polar/sea_ice.html&edu=elem">sea ice</a>, <a
href="/earth/polar/polar_bears_jan07.html&edu=elem">polar
bears</a> peer through cracks in the ice to look for ringed seals, their
favorite food, in the water below. Almost all of a polar bear's food comes
from the sea. The <a
href="/earth/polar/sea_ice.html&edu=elem">floating sea
ice</a> is a perfect vantage point for the bears as they hunt for food.
Unfortunately, the amount of sea ice floating in the <a
href="/earth/polar/polar_north.html&edu=elem">Arctic
region</a> is shrinking each year, and getting farther apart.<p><small><em>Image courtesy of Ansgar Walk. Creative Commons Attribution-Share Alike 2.5 Generic license.</em></small></p>

<a href="/earth/polar/inuit_culture.html&edu=elem">The
Inuit</a> are the native cultures that continue to live on coastal areas of <a
href="/earth/polar/arctic_tundra.html&edu=elem">Arctic
tundra</a> in Canada, Alaska (USA), Siberia (Russia), and Greenland. This
picture shows several Inuit constructing an igloo with blocks of <a
href="/earth/polar/cryosphere_snow1.html&edu=elem">snow</a>
in November, 1924. Traditionally, Inuit lived in igloos during the coldest
months and tent-like huts during the warmer months.<p><small><em> Library of Congress Prints and Photographs, Photograph by Frank E. Kleinschmidt</em></small></p>

Icebergs floating near Cape York, Greenland
in September 2005. Icebergs are large pieces of ice floating in
the <a href="/earth/Water/ocean.html&edu=elem">ocean</a>
that have broken off of <a
href="/earth/polar/cryosphere_glacier1.html&edu=elem">ice
shelves or glaciers</a> in <a
href="/earth/polar/polar.html&edu=elem">Earth's polar
regions</a>. They are a part of the <a
href="/earth/polar/cryosphere_intro.html&edu=elem">cryosphere</a>.
Approximately 90% of an iceberg's <a
href="/glossary/mass.html&edu=elem">mass</a> is below
the surface of the seawater. Because ice is less dense than water, a small
portion of the iceberg stays above the seawater.<p><small><em>Image courtesy of Mila Zinkova, Creative Commons Attribution ShareAlike license</em></small></p>

Greenland’s <a href="http://www.windows2universe.org/earth/polar/cryosphere_glacier1.html">ice sheet</a> saw a record <a href="http://www.windows2universe.org/headline_universe/olpa/greenland_10dec07.html">melt</a> in July 2012. Scientists studying this event have found that this melting event was triggered by an influx of unusually warm air and amplified by the presence of a blanket of thin low-level <a href="http://www.windows2universe.org/earth/Atmosphere/cloud.html">clouds</a> which pushed temperatures up above freezing. For more information see the <a href="http://www.news.wisc.edu/21638">press release</a> from the University of Wisconsin Madison.<p><small><em>Image courtesy of University of Wisconsin-Madison</em></small></p>

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Explore Earth's Polar Regions

Geography and Geology at the Poles

Location The polar regions are the areas that surround Earth’s geographic North and South Poles. ...Read more

Magnetic Field at the Poles

Earth has a magnetic field. If you imagine a gigantic bar magnet inside of Earth, you'll have ...Read more

Polar Atmosphere

Phenomena in the Polar Atmosphere There are some unique phenomena that happen in the atmosphere ...Read more

Polar Oceans

There are two oceans in Earth’s polar regions: the Arctic Ocean, which occupies most of the ...Read more

Ice (The Cryosphere!)

The cryosphere includes the parts of the Earth system where water is in its frozen (solid) ...Read more

Polar Life

All sorts of living things call Earth’s polar regions home – from tiny lichens encrusting the ...Read more

Climate Change in Polar Regions

The effects of climate change are not felt with the same intensity in all parts of the world. ...Read more

Our Changing Planet

When we look around us, we can see that our planet's climate is changing rapidly. The National ...Read more

Arctic Cultures

There are people of different cultures and backgrounds who live in the Arctic region. Read ...Read more

Exploration at the Poles

Polar exploration includes the physical exploration of the Arctic and the Antarctica. The Arctic ...Read more

Postcards from the Poles

Antarctica is unique. It's cold. It's remote. And for the most part it is covered with ice. ...Read more

More about Earth's Polar Regions

Global locations of visitors using this page right now

Poles in Space
Polar Games and Activities
Resources for Teaching About the Poles and Cryosphere
Polar Links

Historical Events

4/19 Death of Charles Darwin, English naturalist, on this date in 1882 Details

4/19 F5 tornado hits Brownwood, Texas on this date in 1976

4/19 Soviet Union launces Salyut 1, First Space Station, in 1971

Full Earth and Space Science History Calendar (Members only)

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4/19 National Park Week
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4/21 Green Week
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4/22 Earth Day 2014
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Did you know?

Did you know that the Earth’s magnetic field protects us from radiation from space?

Do you know what causes the different phases of the Moon?

Earth and Space Science Concept of the Day

Do you know what this word or phrase means?

Tide

xTide : A tide is the regular rising and falling of the ocean's surface caused by the gravitational pull of the Moon and the Sun on the ocean and the Earth's rotation.

Click on the word to find out!

Research Highlights

Marine Scientists, Students Find Widespread Floating Plastic Debris in North Atlantic Ocean

Despite growing awareness of the problem of plastic pollution in the world's oceans, little solid scientific information has existed about the nature and scope of the issue. This week, a team of researchers...Read more

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Global Learning and Observations to Benefit the Environment

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