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life_01

Article, Online Resource

Looking For Life In Antarctica

If you want an idea of the conditions on Mars, journey to Antarctica. Take a close look at the work of an astrobiologist studying Antarctica's valleys, the "most Mars-like places on Earth."

hot_spring_01

Article, Online Resource

Mapping Hot Springs on the Deep Ocean Floor

At the bottom of the ocean, how do scientists find their way around? This marine geologist's work includes helping to create accurate, high-resolution maps of the sea floor.

rainier_01

Article, Online Resource

Mapping Mt. Rainier

Beneath the glacier-clad summit of Mt. Rainier lies an active volcano, which has more than once produced enough molten rock to bury an area the size of Tacoma and Seattle combined almost 10 feet under.

stromatalite_01

Article, Online Resource

Retrieving a Stromatolite from the Sahara Desert

Why did museum scientists travel to the Sahara to retrieve a boulder? This stromatolite was built by microbes, the only life that existed on Earth until about a billion years ago.

zircon_01

Article

Zircon Chronology: Dating the Oldest Material on Earth

The mineral zircon serves as a tiny time capsule, recording geologic events—it's especially useful because the oldest discovered grains (4.2 billion to 4.3 billion years old) are not much younger than the Earth itself.

901a

Article, Online Resource

Inge Lehmann: Discoverer of the Earth's Inner Core

Each one of the thousands of earthquakes that occur every year offers a brief glimpse of what's happening deep inside the Earth. Lehmann used seismic signals to change our knowledge of the Earth's core.

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