Geoscience Crossword

2. Forms the nuclear mass of a continent or the central basin of an ocean
3. Close relationship of two factors that cause them to impact how each other change
8. Process where the nucleus of an unstable atom loses energy by emitting radiation
11. Determining the relative order of past events or objects
12. The true age of a rock or fossil
13. The presence of oxygen
14. The structure of the Earth's crust and results of the rigid plates that move over the mantle
18. Branch of science studying earthquakes
21. Meteor that survives its passage through the Earth's atmosphere and hits the ground
22. Representation on a map of the natural and artificial features of an area

1. Time taken for the isotope to decrease into half its original value
4. A massive, irregularly shaped slab of solid rock. Also called tectonic plate
5. Movement in a fluid where hotter and less dense matter rises and colder and less dense matter sinks
6. Dating rocks using the relative proportions of particular radioactive isotopes
7. process by which rock is broken down, such as erosion and weathering
9. A living factor
10. Tectonic plates meet and hte edge of one plate descends below the edge of the other
13. A non-living factor
15. Process that help build up the Earth
16. Waves of energy that travel through the Earth's layers
17. Branch of science studying the magnetism in rocks
19. An absences of oxygen
20. Different forms of the same element that have a different number of nuetrons