The sets have all been reversed so that you can print it on the back side of cardstock or patterned paper for scrapbooking or cardmaking. You can learn to make your own printable block letters using most fonts and Word Art in Microsoft Word.he sets have all been reversed so that you can print it on the back side of cardstock or patterned paper for scrapbooking or cardmaking. You can learn to make your own printable block letters using most fonts and Word Art in Microsoft Word.
The Cretaceous also saw the first radiation of the diatoms in the oceans (freshwater diatoms did not appear until the Miocene). The Cretaceous-Tertiary extinction. The most famous of all mass extinctions marks the end of the Cretaceous Period, about 65 million years ago.As everyone knows, this was the great extinction in which the dinosaurs died out, except for the birds, of course.he Cretaceous also saw the first radiation of the diatoms in the oceans (freshwater diatoms did not appear until the Miocene). The Cretaceous-Tertiary extinction. The most famous of all mass extinctions marks the end of the Cretaceous Period, about 65 million years ago.
3. PermianâTriassic extinction event (End Permian): This one occurred right about 251 million years ago. It is the largest extinction event that is currently known. It led to the extinction of â57% of all families, 83% of all genera and 90% to 96% of all species.rdovicianâSilurian extinction event (End Ordovician): It occurred about 450â440 million years ago. It actually consisted of two different events, in total they annihilated 27% of all families, 57% of all genera and 60% to 70% of all known species.