The Deforestation of England Today's typical English countryside of rolling green fields and few trees did not evolve naturally. England was originally wooded. Forests of oak and ...

Jazz   Jazz music, an art form original to the United States, originated in the southern city of New Orleans at the turn of the twentieth century. It combined the elements of ...

Debating the Agricultural Diet     An affluent society is one in which resources are ordinarily not scarce and most society members have achieved a general level of econ...

Life on Mars Astronomers strongly suspect that Mars currently has no liquid water, diminishing the chances for life there now. But running water and a denser atmosphere in the pas...

Erratics and Drift   In the nineteenth century, scientists theorized that glaciers (ice sheets) covered much of Earth's surface during an ancient very cold period known as the...

TF阅读真题第850篇The Australian Megafauna Extinctions

TF阅读真题第875篇Life in the Desert   Life in the Desert     In the austere and inhospitable environment of the desert, each inhabitant must be highly specialized ...

The Nile River Valley Though the verdant green course of the Nile Valley appears to be the very antithesis of the bleached Saharan sands through which it flows, these two contras...

Diving for Food by Birds     Seabirds are physiologically adapted to dive underwater for food, a strategy that necessarily poses problems. An obvious problem is that whe...

复时间 2022-09-28 2023-12-13 2024-04-13 2025-04-12 Adaptations of Marine Mammals     Warm-blooded marine mammals and birds require some special adaptations to permit t...