Piranhas at Home

Picture pushing a block of clay against a wall. The clay next to the wall would be crunched upward.. The area behind where it was pushed up would buckle downward. That corresponds to the formation of the Amazon Basin, a depression in the earth that runs the length of South America east of the Andes.. … Read more

The structure of an Insects

The structure of an Insects The fundamental difference in the structure of an insect and that of a bird or mammal is that an insect is an invertebrate—that is, it has no backbone or bone structure of any kind. The strength of the body lies in the exoskeleton which is soft in a few cases, … Read more