A cube fish tank has a side length of 8cm and is filled with 6cm deep water. After putting in a piece of coral stone, the water surface rises to 7cm. What is the volume of this piece of coral stone?
一个正方体鱼缸棱长是8cm，装有6cm深的水，放入一块珊瑚石后水面上升到7cm，这块珊瑚石的体积是多少？
<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">8 * 8 * 1</gadget>
<output>64</output>

<result>64</result>