Across
- 1. A phenomenon by which magma from Earth’s mantle comes up at the mid-ocean ridge and creates new oceanic crust
- 2. An animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment
- 3. Huge piece of crust that slowly moves on the upper, ductile part of the mantle
- 4. A place where two tectonic plates slide past each other
- 6. When rock particles or sediments are pressed together or packed down by gravity and the pressure of overlying rock layers
- 9. A scientific law stating that, within a sequence of layers of sedimentary rock, each rock layer or strata is older than the one above it
- 11. When compacted sediments stick together and turn into rock
- 12. The mechanical or chemical processes by which gravity, water, wind, and ice break rocks into smaller pieces
- 15. The process by which gravity, water, wind, and ice deposit weathered and relocated sediment
- 18. A place where two tectonic plates move toward each other and collide
Down
- 1. The process in which a denser plate is pushed downward beneath a less dense plate when plates converge
- 5. Rock formed deep underground due to heat and pressure
- 7. The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured
- 8. Rock formed when lava or magma cools, forms crystals, and solidifies
- 10. A method for determining the approximate age of a structure by comparing its placement to that of surrounding geologic structures
- 13. The process by which gravity, water, wind, and ice remove and transport sediment from one place to another
- 14. Rock formed when particles of other rocks are deposited in layers and cemented together
- 16. A place where two tectonic plates move away from each other
- 17. A method for determining the exact age of an object by studying its physical properties, most commonly the amount of radioactive isotope decay