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.
There are many variables to take into account, but the tiger is much more of a solid animal overall. One bite or a strong blow from the tiger could take a great dane down, I'd imagine. My money is on the tiger! I'd have to say that the Great Danes wouldn't stand a chance if it came down to a fight.