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 tiger is the largest feline in the world, with the tiger growing to around 2.5 metres in length. The tiger is the most powerful of all the big cats, and is native to east and southern Asia. The tiger is feared by most human beings who inhabit settlements within the tiger's territory.