This causes pieces of the continental crust to crack and pull apart. Some slabs of the crust sink, causing a rift zone. If the lithosphere continues to spread, a narrow sea can form. Continued spreading produces an ocean basin and ridge system.
Confidence votes 3. a tiger is a mammal because they give milk to their young and produce milk. They breath the air form of oxygen and produce milk. They fulfil the criterion that need to be fulfilled by a mammal. Thse being that they are warm blooded, animals that give birth to live young and sucle them.
The other answers are correct. The tiger is the official animal of Korea. From the Korean Times: The tiger may well be Korea's most beloved animal throughout its history. The country was once dubbed the ``nation of tigers'' as it has mountainous areas that provided them with a good habitat. The animal has been a symbol of bravery, strength and dignity, and hence 2010, the Year of the Tiger, according to Chinese astrology, will be fervently hailed as a year of good fortune and vigor.