Definition of relative dating
One observation was that geologists, scientists that study the earth, noticed that rocks of similar type and formation existed in Canada and in Scandinavia as well as other locations.
Other geologists found fossils, or evidence and remains of once-living organisms, of the same plants and animals on widely separated continents, sometimes in locations where they never could have existed, such as tropical plant fossils in Antarctica.
His theory, known as continental drift, also stated that the continents were still moving today.
Wegener believed that Pangaea looked something like this illustration.