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.
A Brief History of Earth. Mass extinctions--when at least half of all species die out in a relatively short time--have happened only a handful of times over the course of our planet's history. The largest mass extinction event occurred around 250 million years ago, when perhaps 95 percent of all species went extinct. Top Five Extinctions