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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Red beds？

Definition 26.9 High School Earth and Space Sciences · 第 26 章 — The Early Earth and Its Atmosphere

Red beds are sedimentary rocks — sandstones, siltstones, shales — coloured red by a coating of iron(III) oxide, hematite, on their grains. They form only where there is oxygen enough to oxidise iron.

Red beds: Cathedral Rock near Sedona, Arizona, built of Permian red sandstones. Photograph Wendy from Pennsylvania, CC BY-SA 2.0 (Wikimedia Commons).

Oxygen in the air through time (schematic, logarithmic scale): the curve joins the measured bounds and hides the ups and downs of the real record. The shaded interval is the Great Oxidation Event; the red bar marks the time when banded iron formations were common, 2.4 to 1.8 billion years ago. Eons from the International Chronostratigraphic Chart.

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