We observed rocks under a microscope. We had to figure out if they were ignius, sedimentry, or metamorphic. I think the rocks were sedimentry because sedimentry rocks are rocks that are mixed with sand and other small rocks. Sedimentry rocks are the "left over" from the mountains. These rocks had sand mixed in with them and because of their location they might have come from the mountains. The Appalachain Mountain chain is close by here and if the rocks from the mountains got into the water system near the mountains then the rivers there could have branched off into the Passaic River. That's how we found them.

I think the rocks we found are also ignious rocks because when two plates are pushed together they form a mountain range. When two plates have a collision like that there is so much force that some of the rock gets melted and turns into magma and hardens into ignius rocks. I think that the Appalachian Mountain Range was a result of two plates colliding and when they did, they formed magama and the rivers near there brought that ignius rocks to the Passaic River.
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