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.
From Wikipedia, the free encyclopedia. The lion (Panthera leo) is a large mammal of the Felidae (cat) family. Some large males weigh over 250 kg (550 lb), so it is the second-largest living cat after the tiger.Today, wild lions live in sub-Saharan Africa and in Asia. Lions are adapted for life in grasslands and mixed areas with trees and grass.he lion (Panthera leo) is a large mammal of the Felidae (cat) family. Some large males weigh over 250 kg (550 lb), so it is the second-largest living cat after the tiger.