1, That's a cubic kilometer.

2, A cubic kilometer of seawater, go into the ocean and imagine a box .

3, You get that out of 1 cubic kilometer of seawater.

4, Altogether, the instrument, known as IceCube, spans a cubic kilometer of ice.

5, The earthquake triggered submarine landslides that dislodged hundreds of cubic kilometers of sediment on the continental slope.

6, Reasons to worry: Merapi is capable of producing a Plinian eruption (spewing at least 1 cubic kilometer of magma and producing 20 to 50 kilometer-high ash columns)every 1,000 years or so.