Yes, that is true. Continents slowly move around; for more information, check the Wikipedia article (or other educational resources) for "continental drift". On several occasions, that made most of Earth's landmass come together into a single "supercontinent"; the last such supercontinent was Pangaea, approximately 175 million years ago.
Pangaea
Earths magma moved under the crust and the continents split
the continents have broken up from the continental drift
pangaea
Jurassic
Continental drift is the idea that Wegener created, that all the continents were once a single landmass which he called Pangaea, and they have since drifted apart.
EURASIA
Pangaea
The process that causes changes of the Earth's continents over time is called "Plate Tectonics."
Yes, the continents move and shift around; this is the theory of plate tectonics.
Continents
Continents and Islands