The Early Iron Age     During the Bronze Age (roughly 3300-1200 B.C.E. in the Middle East), civilizations were limited in their use of iron. Most iron occurred not in ...

TF阅读真题第845篇Urbanization of Japan

The Origin of Mars's Moons     Mars has two tiny moons, Phobos and Deimos. The orbits of both these satellites are nearly circular and close to the planet: Phobos orbits...

Parental Care by Frogs Only an estimated 10 percent of anuran (frog and toad) species provide any kind of parental care. But within this 10 percent there is very great diversity ...

TF阅读真题第823篇The Radiocarbon Dating of Prehistoric American Sites

TF阅读真题第811篇Dorset Culture

TF阅读真题第858篇Late Classic Maya Agriculture

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TF阅读真题第798篇Transportation and the Roman Empire

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