Across
- 6. a hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods
- 7. a fossil that is useful for dating and correlating the strata in which it is found
- 8. a theory set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, that explained how continents shift position on Earth's surface and why look-alike animal and plant fossils, and similar rock formations, are found on different continents
- 10. any process of formation or growth; development
- 11. the succession of eras, periods, and epochs as considered in historical geology; the period of time covering the formation and development of the Earth, from about 4.6 billion years ago to teach oday
Down
- 1. the two sub-layers of the earth's crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches
- 2. the geologic age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years
- 3. a basic law of geology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it
- 4. a fracture or fissure in the Earth's crust in which there is movement on either side of the fracture; a place where sections of the crust of the Earth move relative to each other
- 5. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
- 9. the true age of a rock or fossil, tells scientists the number of years ago a rock layer formed