| Term | Definition |
|---|
| Universe | What was created with the Big Bang |
| Expanding | What the universe is doing ever since the Big Bang |
| First Generation Stars and Planets | Formed over millions of years with gravity pulling material together |
| Sun and Solar System | Formed from the death of First Generation Stars |
| Second Generation | Composed of Small, Medium, and Large Particles |
| Large Particles | Make up the mantle and core |
| Medium Particles | Make up the crust |
| Small Particles | Make up the air and gaseous particles |
| Radioactive Particles | Large, heavy particles that split naturally |
| Radioactive Decay is: | The process of unstable particles splitting naturally |
| Radioactive Decay causes: | more particles to be created |
| Friction | What is increased when radioactive decay occurs |
| Heat | What has built up in the crust and melted the earth's interior |
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