Ferric oxide is the most abundant metal oxide, and it is very important in oxidization - reduction of soil and in soil-shaped process.

氧化铁是土壤中最为丰富的金属氧化物，在土壤的氧化还原反应和土壤形成过程中起着十分重要的作用。

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Aluminum is the most abundant metal and the third most common element in the earth's crust and al toxicity is the major growth-limiting factor for crop cultivation on acid soils.

铝是地球上最丰富的金属和第三个最常见的元素在地壳和铝毒害是主要的生存限制因素为农作物的种植在酸性土壤。

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It is a naturally occurring and abundant metal that does not easily corrode (rust). It is often used for pigments metal coatings, plastics(as a heat stabilizer), photographic films and batteries.

天然金属，不容易生锈，常用于油漆中的色料，金属涂层，塑料生产过程中的稳定剂，染料及电池内的电溶液．。

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So it is funding research into getting microorganisms to extract energy from things like metal ions abundant in the earth or solar electricity.

FORBES: Far-Out Energy Technologies Win Government Cash

Now, however, the shiny metal may be getting a bit too abundant.

ECONOMIST: Tarnished gold

Executives said Tuesday they're also developing a foundry designed to produce metal parts from nickel, an element abundant in asteroids, and operate in space, and a class of "Harvestor" craft to extract valuable material from the asteroids.

CNN: 'Fireflies' to scope out space rocks for mining