The Dynamic Earth

2. states that geologic processes that happened in the past can be explained by current geologic processes
4. the breakdown of rock by physical and chemical processes
6. large pieces of the lithosphere that move across the mantle
10. the process by which sediment and other materials are moved from one place to another
13. the process by which other chemicals combine with oxygen
14. a pure substance that cannot be broken down into simpler substances by ordinary chemical means
15. the time needed for half of a sample of radioactive material to decay
16. the sudden and rapid movement of a large amount of material downslope
19. the weather conditions in an area over a long period of time
20. a large mass of moving ice that forms by the compacting of snow

1. living things and the areas of Earth where they are found
3. the color of the powdered form of a mineral
5. any place where gas, ash, or melted rock come out of the ground
7. the rising of regions of the Earth's crust to higher elevations
8. anything that has volume and mass
9. An ordered arrangement of rock layers based on the relative ages of the rocks
11. type of rock that forms from the cooling of magma or lava
12. the trace or remains of an organism that lived long ago
17. the invisible gasses that surround and protect the Earth
18. an underwater or exposed ridge of sand, gravel, or shell material