Across
- 4. a super continent that existed during the late Paleozoic and early Mesozoic eras, roughly 335 to 175 million years ago
- 5. the action or process of classifying something according to shared qualities or characteristics.
- 7. an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.
- 8. form from the accumulation and solidification of sediments, which are particles of pre-existing rocks, minerals, or organic matter, transported by wind, water, or ice
- 10. widespread extinction of a lot of spection in a short time
- 11. an undisturbed sequence of rock layers (strata), the oldest layers are at the bottom, and the youngest layers are at the top
Down
- 1. the vast span of Earth's history, from its formation around 4.5 billion years ago to the dawn of the Cambrian Period, about 542 million years ago
- 2. a scientist who studies the Earth's solid features, composition, and processes, analyzing rocks, minerals, and fossils to understand Earth's history, predict geological hazards, and manage natural resources like water, oil, and minerals
- 3. the remains of impression of a prehistoric organism in a petrified form or as a mold or a cast
- 6. an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 percent of animal species and about 30 different phyla.
- 9. the branch of geology concerned with the order and relative position of strata and their relationship to the geological time scale