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The Geology Behind 5 American Landmarks

science.howstuffworks.com/environmental/earth/geology/geology-american-landmarks.htm

The U.S. is full of exceptional geological formations. HowStuffWorks looks at at five that set the bar high as far as landmarks go.

Pluto: Is It a Planet After All?

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Back in 2006, the International Astronomical Union decided to demote Pluto to the status of a dwarf planet. A historical study challenges that designation.

How Archaeology Works

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Archaeology is the study of ancient civilizations and human remains, such as buildings, art or trash. Learn about archaeology and archaeologists.

How is volcanic ash made?

science.howstuffworks.com/nature/natural-disasters/volcanic-ash.htm

Volcanic ash is what's left after a volcano literally blows its top. Learn how volcanic ash can devastate everything under its gray blanket.

How did the supercontinent Pangaea become seven separate continents?

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The idea of Pangaea comes from Alfred Wegener's hypothesis that the seven continents were once joined as a supercontinent. Learn more about Pangaea.

How Artificial Geothermal Energy Works

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Artificial geothermal energy is made by adding water to naturally hot rocks. Learn about artificial geothermal energy.

Oil Sands: Energy Evolution and Environmental Concerns

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Oil sands are a mixture of clay, sand and water with a small amount of bitumen. Learn about oil sands, find out how energy intensive it is to refine oil sands.

Is there really water on Mars?

science.howstuffworks.com/water-on-mars.htm

Photographs have recently shown that there may be water on Mars. Find out if there's water on Mars and what that could mean for life on Mars.

How Diamonds Work

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Diamond engagement rings. Diamond anniversary bands. Diamond earrings and necklaces. And now, the right-hand diamond ring! The four Cs -- cut, clarity, carat and color. Find out what the fuss is all about.

How Sinkholes Work

science.howstuffworks.com/nature/natural-disasters/sinkhole.htm

Sinkholes are much more than holes in the ground. Learn how sinkholes can cause the Earth to swallow up you, your home and your car.

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