Weekly Checkin Quiz #7

2. Breakdown/dissolving of rock into smaller pieces by either physical or chemical processes.
5. Solid piece of debris (comet, asteroid, meteor) that originates in space and survives its passage through the atmosphere to reach the surface of Earth (or the Moon)
7. Rock that currently exists that geologists use to understand Earth's history
9. Technique used to date materials such as rocks and carbon
10. Volcanic activity
12. Accumulation of particles into a massive object by gravitationally attracting more matter
14. Solid, irregular shaped rocky mass that is smaller than a planet and orbits the Sun. Made of materials similar to those that formed the planets (Clay, Nickel, Iron, Silicate)
15. Act of water, ice, or wind moving/transporting and depositing material into other locations
16. Rocks from the moon
17. Contracting mass of gas that represents an early stage in the formation of a star, before nuclear fusion begins

1. Period of increased impact from meteorites
3. Spontaneous emission of radiation by an unstable nucleus of isotopes in order to stabilize
4. Small bodies of accreted gas and dust that to have orbited the Sun during the formation of the planets
6. Large body of matter in orbit around the Sun or a star and thought to be developing into a planet
8. When gravity causes matter to come together and form larger bodies
11. System in space that holds Earth and other planets around the Sun
13. Rotating disk of matter surrounding a large object in space, caused by the pull of gravity