| A | B |
|---|
| tree rings | Rings located in the center of a tree's trunk that telle age and envirronmental conditions from present to past |
| igneous rocks | Formed from cooled magma. Molten magma on the Earth's crust in called molten lava |
| dendrochronology | The study of trees that help find clues about the tree's past |
| environmental conditions | The kind of weather and surrounding in which trees have grown |
| sedimentary rocks | Formed as sediments are pushed togetherr by the weight of water and other rocks |
| fossils | The remains of any organism from the past |
| sequence | When events happen in a specific order |
| clues | Hints of information that helps someone |
| cycle | A continuous process that repeats over and over |
| erosion | Carrying away of material from once place to another by wind, water, or ice |
| superposition | When items are stacked on top of one another, the layers on the bottom are older than the layers on top |
| tracks | Imprinted fossils preserved in a rock |
| extinct | No longer in existence |
| metamorphic rocks | A result from heat and pressure applied to sedimentary or igneous rocks |
| scar | Dark spots in the tree's rings that tell wheather the tree has been damaged by fire or insects |
