Hello There! ^_^
Your question: Who set up a mission in eastern Oregon...?
Your answer: Whitmans were the ones who set up the mission in the Eastern Oregon.
The answer is option B.
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Silica is something in the magma, so it is a pretty important part of magma because it pretty much a part that makes magma!
Answer: To date rocks geologists first give a relative age to a layer of rock at one location. Then they can give the same age to matching layers of rock at other locations. Certain fossils, called index fossils, help geologists match rock to layers.
Explanation:
