Answer:
The null hypothesis is a typical statistical theory which suggests that no statistical relationship and significance exists in a set of given single observed variable, between two sets of observed data and measured phenomena.
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A rift valley is formed on a divergent plate boundary, which means that the two plates are
a. moving apart - this is the correct answer!
Rift valleys are often filled with lakes. For example, some scientists suggest that the Dead Sea lies in such a rift valley. Other such lake includes Lake Albert in Congo and Uganda.
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The resistance to being scratched is a mineral’s hardness.
This is the basis of the Mohs Hardness Scale.
