Everything Else . A glacier or ice shelf is said to calve in giving birth to an iceberg.
Some Antarctic icebergs have salt-water ice frozen on the bottom.
They occasionally capsize and can then be identified by their green color. The green results from the combination of the normal blue of pure ice and yellowish-brown organic material, dead plankton and algae, dissolved in the ocean water. New questions are answered on the site every Tuesday and Thursday.