Geologic Time

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Across
  1. 3. The time required for a substance to decay to half of its initial amount
  2. 7. The study of rocks formed from the cooling and solidification of molten rock, known as magma or lava
  3. 8. The rule that layers of rock are younger the closest to the surface they are
  4. 9. Relating to the study of the earth's physical structure and substance.
  5. 10. The assumption of age based on layers of rocks
Down
  1. 1. A rock that has been transformed from a pre-existing rock
  2. 2. The process of determining the age of rocks, fossils, and other geological materials using methods like relative and absolute dating
  3. 4. Remains or impression of a creature
  4. 5. The determining a specific numerical age, in years, for an object, artifact, or rock formation
  5. 6. A type of rock formed from the gradual consolidation of loose particles, such as minerals, rock fragments, or the remains of organisms