• Guides explain that it did not result from the action of water and streams like other limestone caves.

    VOA: special.2009.12.07

  • The Portland Cement Association says the gas from the limestone is reabsorbed as concrete ages.

    VOA: special.2009.12.01

  • Carbon dioxide is released in cement manufacturing when fuel is burned and limestone is heated.

    VOA: special.2009.12.01

  • The walls were made of local limestone and bricks of sun-dried mud called adobe.

    VOA: special.2010.04.26

  • The action of oil and natural gas created hydrogen sulfide in the limestone.

    VOA: special.2009.12.07

  • a small amount of fertilizer and dolomite, a powder-like substance made from limestone.

    VOA: special.2011.06.14

  • And it should be treated with limestone if the soil is acidic.

    VOA: special.2009.07.07

  • The limestone developed about two hundred fifty million years ago.

    VOA: special.2009.12.07

  • The surface is made of brick and limestone.

    VOA: special.2009.12.13

  • There are many levels of granite, schist,limestone,and sandstone.

    VOA: special.2009.10.07

$firstVoiceSent
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