Answer:
Paleontologists now have evidence that dinosaurs lived
on all of the continents. At the beginning of the age
of dinosaurs (during the Triassic Period, about 230
million years ago) the continents we now know were
arranged together as a single supercontinent called
Pangea. During the 165 million years of dinosaur
existence this supercontinent slowly broke apart.
Its
pieces then spread across the globe into a nearly
modern arrangement by a process called plate
tectonics. Volcanoes, earthquakes, mountain building,
and sea-floor spreading are all part of plate
tectonics, and this process is still changing our
modern Earth.

Relative
positions of continents during the age of dinosaurs