There is a cuboid fish tank with a length of 70 cm, a width of 40 cm, and a water depth of 20 cm. A small rockery is completely submerged in the water. At this time, the water level rises by 2 cm (the water does not overflow). What is the volume of this small rockery in cubic centimeters?
有一个长方体鱼缸长是70厘米宽40厘米水深20厘米小假山完全浸没在水里，此时水面上升了2厘米(水没有溢出)．这座小假山的体积是多少立方厘米．
<gadget id="calculator">70 * 40 * 2</gadget>
<output>5_600</output>

<result>5_600</result>