Quick Answer. When a solid turns into a liquid it is called fusion, more commonly referred to as melting. When a material moves from one state of matter into another it is called a phase transition. Fusion is just one of approximately different states that matter can phase through.
Before the dinosaurs, there were Triops. Fossil Triops more than 200 million years old have been discovered. By comparison, dinosaurs date back only about 60 million years...just 'youngsters' in terms of geologic time. Triops are distant relatives of trilobites. Triops means three-eyes while the name trilobite means three lobed or three segments.
Giganotosaurus is a genus of large bipedal dinosaurs that lived in what is now Argentina during the early Cenomanian age of the Late Cretaceous period. They were some of the largest known terrestrial carnivores, with known individuals equaling or slightly bigger than the size of Tyrannosaurus.