Across
- 6. imaginary line in middle of Earth dividing it into northern and southern hemispheres. Has a parallel of latitude 0°
- 7. Earth's zero point of longitude, which passes through Greenwich, England
- 13. system of dating based on the history of Earth’s rocks. Physical history of Earth
- 14. trait that allows a plant, animal, or other organism to survive and reproduce in its environment
- 15. the numeric age of a layer of rocks or fossils. Absolute age can be determined by using radiometric dating
- 16. resources whose stock or reserves is limited or fixed (coal, oil, steel)
Down
- 1. threat a naturally occurring event will have a negative effect on humans
- 2. within a sequence of layers of sedimentary rock, the oldest layer is at the base (bottom) and that the layers above are progressively younger
- 3. theory, or idea, of plate tectonics says that Earth's outer layer is made up of large, moving pieces called plates. All of Earth's land and water sit on these plates
- 4. the process where organisms that are best suited to their environment survive and pass on their genetic traits in increasing number to successive generations
- 5. the age of a rock layer (or the fossils it contains) compared to other layers
- 8. an organism that has no living members; no longer in existence
- 9. resources that have the potential to be replaced over time by natural processes (soil, trees, grass, solar energy)
- 10. angular distance of a place north or south of the Earth's equator
- 11. angular distance of a place east or west of the meridian at Greenwich, England
- 12. all living organisms on Earth exist in this sphere(plants, animals, bacteria)