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.
A List of the Types of Tigers. Tigers are intelligent, fierce predators and one of the largest cat species in the world. Unlike other big cats, tigers generally live and hunt alone, only coming together to mate. Each tiger has a distinct set of stripes and no two are alike.