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Across
4.Rocks can contain these from history
5.An opening in the earths crust releasing, lava, gas, and ash
6.Is determined by figuring out the ages of other rocks around it
7.Scitentist uses a seismometer to measure this
10.The point that is directly above the focus of an earthquake
13.Is the earliest of three geological eras
14.This era is also called the Age of Reptiles
Down
1.Which boundary is the one that pulls apart / divide
2.There is a cycle of heat rising and cold sinking
3.the process of the earths plates moving
8.The thinnest and coolest of earths layers
9.Thickest earths layer
11.The supercontinent that formed about 300 million years ago
12.The era about 66 million years ago to the present

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